In Capsman environment, setting up two different SSIDs one per radio band, is straightforward when creating a provision rule matching radio MAC address
So MAC aa:bb:cc:dd:ee:ff = 2,4 GHz radio, provisioning the "SSID2G4" cfg
and MAC aa:bb:cc:dd:ee:f0 = 5 GHz radio, provisioning the "SSID5G" cfg
But when you have to manage tens of APs is a nonsense to create tens of provisioning rules so it's simpler to create a pair of provisioning rules using "HW supported modes" feature.
The question is : what to do when both radios support a common mode ?
i.e. wAP ac supports B/G/N on 2.4GHz and A/N/AC on 5GHZ, so N mode seems to be not suitable to be used in to the provisioning rule because it recalls both bands.
Should I decide to provision N mode for just one of two radios ?
Other question: HW supported modes are : A Aturbo AC AN B G Gturbo GN, there isn't just a "N" mode , what about ?
It would be nice if "radio band" (despite 802.11 mode) was implemented as choice into provisioning rule ....
In WinBox, under [Wifi -> Configuration -> Channel], you can set the band, which you seem to be doing.
In provisioning, you can provision to multiple IP address ranges covering your access points. You really do not need to provision to MAC addresses. If you provision by IP address, you will have more control over your fate, in that you can aggregate the IP addresses to a range. Or if there is such network mayhem that you can't do this, you could put the access points on a vLAN and enforce an IP address range that way.