I have the wired RB450Gx4 in my home running many vlans and two capACs.
Typically I have vlans to separate
etc, not all require wifi though.
For WLANS each capac has two chains so typically I use the 2.4ghz chain for smart devices (on vlans), and the 5ghz channel for home wifi.
I then create a virtual WLAN from each 5ghz WLAN, to create guest wifi at each capac on vlans as well.
In othe words, the router you choose should be able to handle your requirements in terms of separation and control etc.
Just not sure on how to best deal with the large amount of wifi devices in an efficient fashion.
I'd rather manage rats than software. Follow my advice at your own risk! (Sob & mkx forced me to write that!)