If you do have IOT items, a NAS, DLNA, and printer, as those are less likely to leave your apartment, by all means create a WISP repeater and hide them behind it. Do any of these items need to connect to devices on the other side of the apartment?

You also know, I think, that repeaters cut down on available bandwidth, right? Likely you will have plenty of bandwidth, so a 50% reduction won’t be problematic, no?