Amphenol 8-Way Digital Splitter MoCA 2.5 ABS318H, Silver

Yes, MoCA adapters will do the trick. If you have a DOCSIS 3.1 modem, here is a diagram that shows how to hook things up. Make sure you use 5-1675mhz splitters and 70b MoCA (PoE) filters.

Get one from this set: https://www.amazon.com/dp/B09JSK7WD6 Proper splitters are 5-1675mhz. If you happen to have a DOCSIS 3.1 cable modem setup, here is the diagram that shows how to set that up correctly: https://i.imgur.com/LzBSyrl.png Use 70db MoCA filters where specified. https://www.amazon.com/dp/B08HJ4F4D4 MoCA (PoE) filters block MoCA signals, one so that your MoCA signal doesn't reach the neighbors and the other so that the MoCA signal doesn't interfere with the DOCSIS signal going to your modem which is 5-1005mhz band.

Here is a diagram showing how MoCA works with DOCSIS 3.1 modems. I would get rid of that powered splitter and replace it with a 5-1675mhz splitter that supports MoCA. Since MoCA is bi directional and the amplified splitter only amplifies in one direction, it might be the problem. Also get 70db MoCA (PoE) filters and install them as shown on the diagram. Get splitters that meet the need as shown in the diagram with only the number of ports necessary.

Here is a diagram that shows how to use MoCA adapters for DOCSIS 3.1 modem systems. Be sure that splitters are 5-1675mhz for optimum MoCA throughput and ensure you use 70db MoCA (PoE) filters. You can also use a single run of coax using 2 MoCA adapters without needing and splitters or filters. You might need to use F81 barrel connectors to take 2 pieces of coax and turn it into a single run.

Here is a diagram that shows how to use MoCA adapters for DOCSIS 3.1 modem systems. Be sure that splitters are 5-1675mhz for optimum MoCA throughput and ensure you use 70db MoCA (PoE) filters. If you can isolate the modems input coax from the coax using MoCA, filters will not be necessary. That is how I have my system set up since all of the coax connections come into the utility room and modem and router are right there.

Option number 2 is what you want to go with. Replace the amplifier with a 5-1675mhz splitters and use 70db MoCA filters if needed for best results. If you have cable Internet with DOCSIS 3.1 modem and it uses part of the coax you plan to use with MoCA you might want to look at this diagram that shows the connections. The problem with the amplifier is that it ups the signal strength in one direction but not the other. MoCA is bi directional since the devices need to talk to each other. .... and while those coax connectors look like they have crappy connections, if they are tight and the connector doesn't fall off they should be good for now, but I would look into getting compression fittings and compression tool to fix them in the future.

Since you have the coax, here is a diagram that shows how to use MoCA adapters with DOCSIS 3.1 modems. Be sure to use 5-1675mhz splitters and 70db MoCA filters for best results. GoCoax and Kiwee MoCA adapters sold at Amazon are good choices. The referenced Kiwee model has PoE+ Ethernet port. I use that Kiwee model to connect a Unifi U7 In-Wall AP using the PoE+ and then connect a Flex Mini 2.5 switch that is powered by the PoE port on the AP. My system is all UniFi.

You will need to check where those coax segments connect to a splitter. The splitter needs to be 5-1675mhz so it can support the MoCA frequencies. Yes, you can run multiple MoCA adapters and they will communicate with each other, One from the router and one or more client adapters in various rooms.

If you have coax you might want to use that for the backhaul of your satellite WiFi APs. Here is a diagram that shows how MoCA adapters are used with DOCSIS 3.1 modems. Be sure to use 5-1675mhz splitters and 70db MoCA filters. These GoCoax MoCA adapaters should work well for you. The diagram covers the most technically complex situation requiring MoCA filters to keep the signal from your neighbors as well as to keep the MoCA signal from interfering with the DOCSIS modem signal. Adjust your connections accordingly. This is the cheapest tester for mapping your coax. Connect the sending unit in the room and connect the receiving unit to the various possibilities until it lights up. Also useful for Ethernet cables.

Here is a diagram that shows how MoCA adapters are used with DOCSIS 3.1 modems. Be sure to use 5-1675mhz splitters and 70db MoCA filters. These GoCoax MoCA adapaters should work well for you. The diagram covers the most technically complex situation requiring MoCA filters to keep the signal from your neighbors as well as to keep the MoCA signal from interfering with the DOCSIS modem signal. Adjust your connections accordingly. This is the cheapest tester for mapping your coax. Connect the sending unit in the room and connect the receiving unit to the various possibilities until it lights up. Also useful for Ethernet cables.

The third house diagram in this post from GoCoax shows how to connect things. Just make sure that any splitters are 5-1675mhz to support the higher frequencies used by MoCA adapters.