Cyberpower will far more easily replace a failed unit under the man. warranty as it only lasts 2 years. The big connected equipment warranty is a-whole-nother story. I haven't read the entire thing lately, but if I recall properly it's actually covered through a third party, you have to return your unit and proof of purchase to them for inspection, then THEY determine if you have a covered claim or not. Doesn't particularly matter what YOU say :<
Connecting a surge protector BEHIND a ups can cause extra wear/premature failure of the surge protector. The worst case that I've ever seen reported for a ups behind a surge strip was simply more battery switching. That's likely due to overloading the power strip with extras though. So as long as you do the math and know that you have extra capacity, then there is nothing to worry about by plugging it in that way. What you GAIN from a ups behind a quality surge strip is a cleaner input (if your surge strip filters also) and far higher surge resistance than what is baked into these residential units. You'll also see a tighter clamping voltage on a good surge strip than you will find on affordable ups units.
My previous post was off my phone while at work so I chose to be rather short, lol, my bad.