I have been thinking about this lately. Have two Onkyo upfiring and been thinking this could be better. Was on Amazon looking at ceiling speakers today! Tis going to be a wiring challenge but good to hear your outcome.Dumped my 4 Onkyo Atmos enabled speakers in favour of 4 Polk Audio Ceiling Speakers. The difference is astounding. I can actually hear overhead sounds coming from, err overhead. Was aurally pummelled whilst watching Saving Private Ryan and Mission Impossible Fallout (both UHD). And the various sounds whilst watching Stranger Things S:3 on Netflix was unsettling to say the least.