a dedicated UPS circuit so I could have a single, large UPS to backup everything that needs it
That's beautiful and didn't cross my mind. I've done solar installs so my mind always just thinks of that type of battery bank for my needs, that's definitely a viable alternative that I could tie into the cctv system for continuous security as well without adding extra systems. I've only had a small "pc" UPS that crapped out on me years ago but I see they're scalable so I will entertain myself looking at some specs while pondering.