What are your clients? there are various flavours of wireless lan - A, B, AC, AX and then you get into the MiMo and the MuMiMo and without knowing your clients it's impossible to suggest anything sensibly. If you just want an off-the-cuff recommendation then get something from the Unifi U6 range. U6-Lite is OK, U6-Pro and -LR and decent and have tiny differences in spec that are really nothing to do with coverage and the U6-Mesh pretty much does it all in a tiny tubular format. None of them will make you unhappy.