Scaling websocket services with render

According to another post, websocket services do not currently support sticky sessions, which will make them difficult to scale horizontally, however another post mentions that the services themselves don’t hold the websocket connections but a proxy/load balancer services does (see here) which would imply that it is possible to scale these services horizontally?

Could someone clarify here and provide a little more guidance on what the approach should be if u were to try to scale a websocket service horizontally