I appreciate the feedback. I will try again.
I am not trying to run the system when the power is down. However, I live in an area with a lot of wind and trees. With every significant storm the power will flicker. The madVR Envy would routinely crash with this. This unit, surprisingly, runs Microsoft Windows. This was truly limiting my use of the device. Once I put in a UPS the problem was solved. However, the UPS is an inexpensive unit which I intend to replace in any case.
My other gear will have computer chips, but not run an operating system which will crash.
The Trinnov runs Linux, but will likely have similar problems as the madVR envy.
I have thoroughly investigated this. A high end UPS with pure sinewave should not add electrical noise in non-battery mode. It is necessary to get an inline UPS as double conversion will have a fan which runs 24-7.
Also, the unit has to be something I can manage. The Furman weighs over 70 lbs, and I will not be able to personally manage it in my rack.
So, I will go with the CyberPower - CP1500PFCRM2U, available on Amazon for $360, not a huge investment. If I detect a problem such as a hum, I can plug the Trinnov into the Furman Elite-20 PFi and use the UPS just for the madVR Envy.
Again, I appreciate the feedback, which resulted in me thinking this through more carefully.