There should be a way to change WiFi channel, or at least the system should change it by itself, choosing the least saturated one. For 2.4GHz it is clear that it will be almost impossible to select a

I've got 3 M5 Deco units spread out through the house. It's been in place for a little over a year now. My 5 Ghz WiFi coverage is good with a minimum of 1 out of 3 signal in most places in the house.