The MX-w will not have any type of integration or information exchange with the MR, in short it will operate autonomously.
The Wifi configurations of the MX are more limited than the MR, so depending on what you want to configure there is a possibility that it will not work with the MX.
MX Wifi is recommended for small offices where there is no need for more than 1 access point.
In short, avoid mixing environments with MX and MR Wifi.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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