Cable Matters USB C to 2.5Gb Ethernet Adapter with 140W Charging, 2.5 Gigabit Network Speed, USB C to Ethernet Adapter Compatible with USB4, Thunderbolt 4/5, MacBook, Laptop, and USBC Devices

Your title says “power and ethernet” but the post says “ethernet connection and thunderbolt” ... which one is it exactly? If you just mean “power and ethernet,” then here’s a solution: https://www.amazon.com/Cable-Matters-Ethernet-Compatible-Thunderbolt/dp/B0FC61NLVD However, if you want the plug a Thunderbolt monitor into the dongle (which I assume is the case because you want “one plug that goes into each MBP”) then probably the best choice is a Thunderbolt 4 hub: https://www.amazon.com/Thunderbolt-Hub-OWCTB4HUB5P-W125947845-Aluminium/dp/B08NWL5V86/ You’d want two of these. Each one would have the monitor and a USB Ethernet adapter plugged into it. Then your MacBooks could connect to them with a single Thunderbolt cable.