@Alexandre. thanks for the thorough reply. I really appreciate you getting through my long post with all the info. All of my Deco are wired. I don't have any that are getting their signal from...

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....