I never understand this, the amount of people who post on here saying speeds are poor either through power adapters or wifi. You suggest running a cable and 9 times out of 10 people are not interested.
NOTHING will beat cat5e or cat6 its more reliable then wifi or power adapters, and for the sake of one cable from the router no matter where the router is its a no brainer!
I never understand this from some people, I would never dream of using anything but a cat5e or cat6 cable no matter if it was on the other side of the house.
It's not always practical depending on where the device and the router are and if is a bungalow or three storey house you could be looking at 30m+ of cable. Not everyone can drill holes etc though, especially if it's a rental. Sure it may be possible, but it's not always practical.