Enbrighten Add-On Switch QuickFit and SimpleWire, In-Wall Rocker Paddle, Z-Wave ZigBee Wireless Smart Lighting Controls, NOT A STANDALONE Switch, 46199 , White and Light Almond

These ones right here. They do use a radio frequency for communicating with home assistant, that's how they'd been working before. But when the server hiccups the switches have issues. They dont communicate direclty with each other though. https://www.amazon.com/GE-Enbrighten-SimpleWire-SmartThings-46199/dp/B07RQ8K25S You can see that they have a traveler wire slot:https://m.media-amazon.com/images/I/81UfLXcGjPS._AC_SL1500_.jpg