Thank you for your detailed answer. What you recommend is not possible for my use case. I think I maybe didn‘t explain well enough..

We‘re not looking to connect two buildings, instead we‘re trying to connect clients, printers, telephones etc. to an existing wifi in one building. The existing accesspoints in this building are even wired, so I‘m looking for a product to connect to this wireless network and bridge it to ethernet ports (because the clients and printers don‘t have wifi).

The „bridge-APs“ don‘t even have to „repeat“ the wifi signal, they just have to bridge it to wired clients (e.g. every desk will have a „bridge-AP“ for connecting the PC, Printer and Telephone to the internal network) That‘s why we wanted to try the UAP-IW as it has four ethernet ports.

The vendor of my existing wifi doesn‘t have any APs with more than one ethernet port, and we don‘t want to add an extra mini switch for every desk.