I have an even simpler ATO system. I have an RO/DI line going directly to my sump (no reservoir). It runs through a solenoid that comes on every 6 hours for 5 min. The sump level is controlled by a float valve. But as a final failsafe, I also have that double float switch that will not allow the solenoid to come on (and flow water) if that sump level is reached. Have had this set up for a several years, and even my primary float has never failed, let alone the backups.
I should mention though, that my RO/DI system is located upstairs near the kitchen sink (also use RO for household drinking) and has two pressurized (by household line pressure only) holding tanks. And my sump is located downstairs, so always have decent pressure and volume available there.
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