RF group, should be per location. RF groups, are for DCA adjustments, so if Location A and Location B radios can't hear each other, different RF groups are fine.
As for the Mobility, you can do cross mobility failover as of 4.2 and beyond, but you will need to specify the IP address of the management interface on a per AP basis. in 4.2 you can only do this from the CLI, and from 5.1/5.2, you can do this from the GUI.
But do keep in mind, that if you do cross mobility failover, the Layer 2 information needs to be reachable, i.e VLAN, subnets etc.
HTH,
Steve
HTH,
Steve
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