I have a similar setup as you and I got this. It has worked for several years without problem:
APC UPS 1500VA UPS Battery Backup and Surge Protector, BX1500M Backup Battery Power Supply, AVR, Dataline Protection
I have a similar setup as you and I got this. It has worked for several years without problem:
APC UPS 1500VA UPS Battery Backup and Surge Protector, BX1500M Backup Battery Power Supply, AVR, Dataline Protection