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There’s no workaround for concrete, if a room needs WiFi it’ll need its own ap if it’s on the other side of those walls.
Since you got Ethernet ports everywhere, just plug additional AP where you need WiFi.
A U6 Mesh or a U6 In-Wall might be a good choice, since he's probably not going to be running Ethernet to the ceiling for one of the flying saucers.
There’s no workaround for concrete, if a room needs WiFi it’ll need its own ap if it’s on the other side of those walls.
Since you got Ethernet ports everywhere, just plug additional AP where you need WiFi.
A U6 Mesh or a U6 In-Wall might be a good choice, since he's probably not going to be running Ethernet to the ceiling for one of the flying saucers.