While it's true that UPSs will kick off a bit of heat, I have not really had a problem with mounting APC Smart-UPS 2200RM UPSs in a 4 post rack enclosure. Granted, the racks did have a couple ...

Ideally, I’d like to plug the rack PDU into my UPS. That way I can keep the cables managed neatly inside the rack while benifiting from the UPS’ surge protection, power filtering, and backup.