jeffrey1999 :
I wanted to plug my xbox with Ethernet instead of Wi-Fi but I can't get a wire from my router to my room as there is quite a big distance. Can a powerline homeplug or extender be used to plug a Ethernet cable from xbox to the plug or extender?
powerline homeplug will work great for your needs assuming there is nothing causing interference on your powerlines (as stated both ends of the kit will need to be plugged directly into outlet).
If you have to use the extender, don't plug it in right by the xbox as it will get the same lowsey signal as your xbox has.
You should do it at around 3/4 the distance between the wifi router and the xbox, this way the repeater can at least pickup on a 4-5 bar signal to rebroadcast.