Quite right about them needing to be on the same ring main. The speed I get at my PC is basically indistinguishable from what I get when plugged directly into the router, so I'm both happy and perhaps lucky. It was also a lot happier/easier/cheaper solution than laying cables.Be aware those powerpline plugs have to be in the same electricity ring, and will get lower speeds based on distance, how 'clean' the line is (i.e. certain appliances cause interference). The good news is....you can mix and match themI had two pairs of them, lost one plug and found I could add the third and it was 'seen' still.
Powerlines are also mega slow compared to full fat CAT 6 / 5E cables too. Even the fast ones lose a lot of bandwidth so take the ratings with a pinch of salt.
I've also used WiFi boosters, and they work very well too. Alas, I can't recall the brand I used, but it was a great solution to a troublesome brick wall!
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