I haven't had any issues with the 5K monitor and it's about 3 feet from the router. At least for me it works incredibly well.
> kernel panics on the host machine, random flickering […], and USB devices not being reliably detected when plugged into the monitor.
I'll have to check where my APs are, now that I know about this association. But it's been a damn struggle; I feel like 50% of the times I connect to it, I have to disconnect & reconnect USB devices to get them to be detected on the host.