I am with Capn Bloggs on this.
I have used my mains electricity for this sort of set up from when it first became available in the UK, thanks to a techie friend in the Elec industry.
Technically, he assures me, I could receive my whole Internet connection over our electricity supply..........but it is location dependent.........it was "politics" that stopped that.
TP link gadgets from router to any old nearby plug, and then TP near wherever I need ethernet style speeds.
The only place spared this is the man cave. I have not informed SWMBO of this omission.