I have this same question. I have not been able to setup these units so that they operate reliably. I have DHCP turned off, static IPs set for the units with one wifi network for both 2.4 & 5ghz. I have manually assigned channels to each unit with decent spread between the channels and turned the channel bandwidth to 20 so that they don't encroach on neigbouring channels. The last bit of advice seemed to improve matters but not resolve them.

The issue I see consistently is that clients cannot join the network: they just get an error. Sometimes the unit is in some sort of semi-crashed state where I can't even get the login page to load. Pretty terrible really.

I'm going to follow some of the advice on these boards and see if I can resolve this completely.

Same question and same issue for me as well. I have two RE350 and I cannot seem to get them to work together.

I have two RE650 and I cannot get them to work reliably together. My main router is a TP-Link Archer 8. Any ideas?
Bob