The answer to this is more about how you would like things to work. I would personally put everything in a single network in that case. The MX has all of its clients directly connected, regardless of building. Because of this you really want the wireless view to match up. Although you are not using group policy at the moment, it means that id you do "block" something - it will be blocked everywhere. Otherwise, you would have to do into each individual network to perform the same task. Also the organisation reports will be more accurate with a single network. Otherwise, the same client will be seen in multiple networks (MX and MR) and in effect get double counted.
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