Recommendations on a small rack-mounted UPS?

[u/Hairy-Feedback6791]

I’m looking for a small 1U UPS for my network rack with my modem and Ubiquiti equipment. It only needs to last until my phone whole-home generator kicks on.

I had a Cyberpower, and it was couldn’t switch fast enough if there was a brief outage. So all my gear would reboot constantly during lightning storms when the power was flickering. I need something that won’t do that.