If you’re looking to install more than one wireless AP then I’d stay away from the MX-W models. The wireless in the MX operates independently to the MR wireless. So if there is going to be a few devices you’ll want them all to be MR - that way roaming will work correctly, as will the auto power and channel, and it will be easier to configure. I’d be thinking MX67 (the ‘C’ model if you want cellular backup) + MS120-8FP (you might well need the FP with three APs) + MR (of some form).
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