I am running Unifi's controller to handle 2 APs and 2 switches at my house, plus 3 APs, 3 switches, and a USG that are remote (at my parents' house). I currently run the controller on a Synology ...

The UniFi AP AC PRO is a fairly small device, measuring just 196.7mm in diameter and 35 mm in thickness. Inside the UniFi AP AC PRO is two radios: one 2.4GHz and one 5GHz.