Re: Well that was an invisible problem
Last year I got involved in a network upgrade for a charity, the 8 new WiFi AP's (needed to cover the site)
This is the exact problem that made me grateful for Netgear's Orbi. I was at a site which was protected (historical value) so cabling was an issue. A Netgear Orbi router and 4 satellites pretty much sorted it, although it took me a bit to get the daisy chaining going (first enable fun things like beam shaping and MIMO, then get on with daisy chaining).
I personally prefer APs linked via cable, but this worked surprisingly well.