can I also buy 4 for each room 1? the walls are extremely thick I would connect 1 directly to the main router with lan and then use one for each room as a mesh.
It worked fine for me, I bought 3 pieces and installed the system in a very old restaurant in Geneva with very thick walls. Result: everywhere top wifi up to the farthest corner of the kitchen, warehouse and toilets, on the terrace and at least also on the opposite pavement at the competitor's!!! ( Swisscom fibre optic, 320 Mbs ) Pavement opposite approx. 85 Mbs