From what I remember reading, you should not do that. Only plug in PDUs or directly connect equipment to a UPS. You’re meant to put the surge protection before the UPS. I think it’s because the circuitry in surge protectors can mess with what the UPS thinks the actual load is.
I believe some UPS brands might also void parts of your warranty if you use them with a surge protector plugged in.
I believe some UPS brands might also void parts of your warranty if you use them with a surge protector plugged in.
https://www.apc.com/us/en/faqs/FA158852/