The Denon is border line, but if it's been OK, and never faulted it or the APC on power up, it'll be OK. Everything else is fine.

The problem has to do with the power supply design of the equipment and the size of the capacitors inside it. Large amps, which try not to limit current, and have a big capacitor bank are the problem. They have a massive inrush at start, and I don't know why, but many conditioners play with the voltage level in order to keep up, and then over-volt the PS, and then bad stuff starts to happen.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris