@JKa >(Preferred) exchange the primary m5 with a compatible mesh router that has more Ethernet ports. Another option is to buy simple 4-5 port Gigabit switch and connect it to one of Main Deco ports,...

@JonR I also forgot to ask you what is the speed of your Internet connection. If it is under 500Mbit now and will be in the next 5 years - no need to spend on WiFi 6 Deco equipment such as X20, X60...

@JKa Why can't you connect TV to Main Deco instead of router, and music streamer to router instead of Main Deco?

@JonR You need to be more specific talking about "performance improvements" you expect. Pick one: 1. Elimination of dead spots; 2. Download speed improvement when connected to Satellite Deco; 3....

@TP-Link_Deco After few experiments with satellite M5 Deco, I suspect I know where the issue might be. First, my network layout: M9 Plus Main Deco in the middle of the first floor, M9 Plus Satellite...

@Stevieruss I have definite answer now. I've got additional M5 and wired it. On startup, this is what it reports in logs: daemon.notice awn[1214]: [awnd_eth_handle_neigh:3941]: Activaing Ethernet...