The wireless in the MX is designed for home / small office use. Anything other than that you really want dedicated wireless access points. Let the processor in your router deal with handling web traffic / AMP rather than working out which channel has the least amount of interference.
The MR28 is a well priced access point for home or small office thats Wifi-6 and has the full wireless feature set.
How many wireless clients are you looking to support?