UniFi AP, setting the IP address and VLANs

[MrWu]

Hi all;

I have a UniFi setup as a dry run to roll out in September:

unifi vlans and ip address.jpg

The UniFi APs are setup on my Flat network (10.18.9x.xxx) at the moment with Microsoft NPS running RADIUS and seems to work ok.

Along side this I have setup a new Netgear core with 3 VLANs set at the IP range 192.168.9x.xxx range, for testing I have set it to open and Netgear Core as the DHCP , it picks up the relevant IP and a bit more work to let it see the Sonicwall gateway and that should be ticked off my list...but production wise I want to use the NPS / RADIUS on these

I understand that different SSIDs should be seperated into different VLANs but what about the UniFi APs? I have set the APs as 10.18.9x.xxx, controller software and RADIUS server on the same subnet and is simple and working.

I will have 60 APs would this cause excessive broadcast if I have them on my main IP network?

In the UniFi Controller I can set the SSID to point to my RADIUS server (10.18.9x.xxx) and then I could link a VLAN with that SSID (VLAN would be in 192.168.9x.xxx range) would this still work?

Thanks as always