Will I get the benefits of a wired connection over wireless using a ethernet over power connection?

Also no gaming drop on my kids consoles elsewhere in the house, using ethernet over power!

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do they have to be on the same circuit? as in the same switch in the power box? or will it work over any?
 
Ive got 10 year old wiring, slight difference in speed on different circuit but not enough to worry about. But for the cost of decent adaptors its a risk I would take multiple times. I've advised many friends to swap and they have never had issues. There kids finally stopped asking to upgrade internet as games dropping out other wifi before.
 


Main socket it is. Thanks for all the help. I'll be sure to ask again here if I have any trouble. Won't be getting them for a couple weeks.