You can do it, but it adds a lot of complexity. For the existing MR84's, could you dedicate one band (such as 5Ghz) to link them? If so, get directional antennas to boost the signal for the MESH link. Is there any chance of using a power line extender for the remote AP (making it wired again)? Failing that, any chance of using a power line extender and adding an AP in between the other two to reduce the size of the MESH link? https://www.dlink.co.nz/home-solutions/connectivity/powerline
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