I would like to link my XBox via DLan. At the moment I only use Lan. I play challenging online games like GTA or Battlefield. Do they always run smoothly? I can't imagine that.
If the house wiring already participates. However, there may be quite different problems. Which internet provider do you have?
Surely this is… 1 part in socket and via Ethernet cable to the router…
The others in any socket and with Ethernet cable to the device
O2
Then powerline adapters may be a problem with your connection. Take there rather a Wi-Fi mesh solution.