due to an ato failing and dumping 10 gallons in my upstairs
Controllers are way cool.
However, the correct answer to this IMO is not more control, but a better system.
Have an ATO reservoir that's sized so that it doesn't matter if it gets dumped.
I have about 4 gallons in a 5-gal bucket, for example....around a week's worth. No biggie if it gets dumped into my 100-gallon system.
But if you had that ATO reservoir on a 10 gallon tank, it would be an insane ATO. It could literally turn the into an amazon river tank in one malfunction or user-driven accident.