@undeniable 

Personally not used this device, but according to the specifications it does indeed support Fast Roaming.  However in terms of AI Roaming, im not so sure

Bear in mind the wall editions are designed for a single room like a hotel room or dormitory, therefore roaming is not really required as it will only be used in that one room.  Therefore these devices may not support all the features that the standard EAPs would, also wont be anywhere as near powerful. 

You also dont mention if you have a controller in place?   AI and Roaming both require a controller online to operate.  Without a controller this will be client side roaming, Apple devices are particularly awful at this!  :)