I have vSZ 7.2 Essentials and R550+R750. 2 zones: Default zone (WG: Default) and MyZone. All my SSID-s are in MyZone in WG=Default.
Problem: 5 clients which are always in SSID=screens need to use only 2.4GHz. How to achieve this? I use WPA2/3 PSK in this SSID. The best option would be to restrict by device (by MAC for example). I can tolerate all the devices in SSID use only 2.4GHz also.