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Are you using 2.4 or 5ghz? 2.4 will blast through walls, to an extent, where 5ghz will struggle. I’ve seen situations where the 2.4 band is completely saturated by neighbors and the solution was that every other room needs its own 5ghz puddle to achieve top speeds.

This kind of setup is easily achievable with UniFI POE gear, but will hit the 5 device limit of this router. The original USG didn’t have this limit.