Generic UPS and AVR would help in reducing the noise as well . But the issue here in regards to using these computer grade gears for serious audio is peak current delivery amongst others.
Computer grade protectors tend limit the available current out of the wall outlet even though the KVA ratings would be high.In a single peak , most decent amps would demands tens of Amps to reproduce the dynamics without distortion. These is where the audio grade electrical protectors come in. I agree u dont need ultra high end protection from the makes of PS audio and such but make sure u don't send distorted signal to ur speakers. The easiest way I guess would be to connect power devices directly to wall outlet. Low power equipment could go into these computer grade protectors.
Just sharing what i dug out while I was in the same path.