I've had a Cyberpower for almost 10 years with no issues.

CyberPower CP1000PFCLCD PFC Sinewave UPS System, 1000VA/600W, 10 Outlets, AVR, Mini-Tower https://smile.amazon.com/dp/B00429N192/ref=cm_sw_r_apan_gl_i_FNRV40K89V6MS3A4KE0X?_encoding=UTF8&psc=1

I just recently bought an APC. Only had it a couple months, but so far so good.

APC UPS 1000VA Sine Wave UPS Battery Backup and Surge Protector, BR1000MS Backup Battery Power Supply with AVR, (2) USB Charger Ports https://smile.amazon.com/dp/B0779KYKLB/ref=cm_sw_r_apan_gl_i_6ZH7CZ1G8X591QKEDDY1?_encoding=UTF8&psc=1

You may need something with more wattage, but I just wanted enough for the server to shut down gracefully.