your setup pretty much like mine

unifi---mikrotik hap ac2 (disable wlan)---dlink dgs-1100-24p

then from switch i got

1 ubiquiti nanoHD on first floor
1 ubiquiti AC Lite on second floor
1 ubiquiti AC Lite on second floor Master bedroom

i run cat5e lan cable for each of the room plus my hall+ my poe cctv point + each of wireless access point location

like darren said, i also run my Unifi Controller on raspberry pi 24/7. cheap way instead of cloud key.

all my networking item centralized in my store room underneath my stair. make sure u got some ventilation in and out from this location

overall, the wireless coverage has been great and no dead point for 5ghz band i can say.. everything seems working smoothly