I broke down and bought new amplifiers. It was a bit of a struggle to determine the configuration. I narrowed in on the Emotiva line and the Monoprice line. Both had a chassis with a power supply that was utilized with individual amps connected to the PS rails. Depending on the configuration, you could get all 11 channels out of the same box, sacrificing available power.
Ultimately, I opted for the Emotiva. One chassis for LCR (XPA-3) and a different setup for the non-Atmos surrounds (A-5175).
Crazy part was they were delivered to the wrong house about 4 miles away. Luckily, the mailing label had my phone number and the home owner called me. Turns out he was a custom installer in a previous life.
Both unpacked and ready for a bourbon break.
The next day Emotiva sent out a text promotion. 30% of purchase price worth of future store credit for any purchase. F-me!
I sent an email to customer service the next day to see if they would extend the 30% to my prior purchase. The DID. They earned some loyalty with me for that. So, I picked up another A-5175 for the Atmos surrounds I was building. I retired the Denon AVR-4806 that my friend Barry had given me early in my HT pursuit. (Thanks again Barry!)
Retired Denon (They don't make back panels like this any more. It was also a 55lb beast.)
That necessitated an entire rack shuffle and rewiring. I did a lot of clean up.