My lowest LQI is currently 43. If you say that is good enough, I’ll just leave those be unless they malfunction.
I have 5 APs around the house so all my 2.4GHz wifi spectrum is used (Ch 1, 6, 11). Neighbors are not close enough to have strong signals, if anything, I would be the cause for my own interference. I keep my 2.4GHz SSIDs to 40MHz and set them all to 16dB. I only put IoT or low bandwidth / old devices on 2.4GHz and exclusively use 5GHz for high bandwidth devices. My devices when on the ConBee II never had any issues with wifi interference as the mesh was rock solid… but I would not exclude it as I use Unifi hardware and am always on their latest beta firmware. I could not figure out what Zigbee channel I am on.
The sticks are on top of a metal networking rack, on a magnetic stand, connected to a USB3 port via a shielded extender cable. The ConBee II was there too and never had issues.
I am aware that sitting the radios on top of a metal rack will likely introduce some signal blockage in certain directions but the mesh with the ConBee II never seemed to mind. This room is on the upper floor, so the omnidirectional antenna should do a good job on the upper floor, and a poor job (worse) right under and to the left as the lobe is likely blocked to some extent by the rack. But… that is where the mesh should come in… and I have routers all over the house evenly spread.
With the ConBee II the zha-card showed both values. I discovered after switching to the Sonoff coordinator that the latter does not provide RSSI. As for LQI it is still a head scratcher… my highest LQI is 185 and most of the devices with that LQI are in the same room as the coordinator with minimal blockage.
I forgot to mention that I have routers do the same thing. I have some that surely have way better routes back but they ignore them. At a workbench in my office I have 7 plug in switchable sockets and 1 in-wall socket, all zigbee, and their LQIs vary between 43 and 109 even though they are on the same power strip. 