Powerline Ethernet Adapters and house circuitry query

I'm looking to purchase a pair of these to improve the internet connection to my desktop. The wireless doesn't function particularly well and the router is upstairs and away from my downstairs room.

I know these have had some great reviews, but my worry is the possible circuitry issue regarding same circuit wiring. I am unsure if the downstairs and upstairs circuits are separate or linked (I have no experience in this area) which can apparently be an issue.

Also with the adapters, can anyone provide any more information on their consistency? My wireless has excellent speeds, but it frequently cuts out for no discernible reason which can often make gaming feel like a chore. If I were to buy these I would want to make sure they are more consistent than my wireless connection.

Thanks in advance!

Oh, and simply using an ethernet cable is not an issue due to landlord restrictions, otherwise I wouldn't be looking into this!