You can see all the MR models at the URL below, and there is a tool to help you choose a model or MR. https://meraki.cisco.com/products/wi-fi/models/ The WiFi integrated into MX units is not "fully" compatible with MRs, but to the best of my knowledge, all MRs will work with all other MRs. You could extend the range by getting an additional MR and operating it in "mesh" mode. https://documentation.meraki.com/MR/Wi-Fi_Basics_and_Best_Practices/Wireless_Mesh_Networking Note that you don't take a performance hit when you do this, so you always want to use a cable when you can.
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