I am using Bridge@EWC topology for our eduroam VNS. I use B@EWC because it is very easy to deploy with zero configuration on switch side. Just plug the AP to what ever vlan is availible, AP learn the EWC IP via DNS lookup, approve the AP on EWC and it is good to go in about a few minutes.
But now I have a need to differentiate the WLAN traffic per location and I don't want to give up using B@EWC topology. So is it possible to use the "Location" or "Zone" settings on the APs to assign different ip ranges per location?