Is it suppport single radius server and multiple site scenario

Yes this is possible, the only thing you have to consider is accessing the RADIUS server from multiple locations.

You have a few different ways of implementing this, for example you can setup port forwarding so your RADIUS server can be accessed externally.

If you're using cnMestro on-premise you can setup a proxy for all traffic to go through the controller. More info here: https://community.cambiumnetworks.com/t5/cnPilot-E-Series-Enterprise-APs/Source-of-RADIUS-authentication-and-accounting-packets/td-p/78691

While I've never tried it a VPN between the sites should also work.

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