I think the threat of a runaway that actually floods your house is overblown. They can dump a lot of water for such a small hose, but you can also keep your res low enough to avoid a major catastrophe. Really the first day is all you have to worry about, and then it’s fine tuning for a few more days. Just set them up on a day off and monitor them like you did with your plants during your first grow.
I’ve had no runoff let alone a flood this cycle. This was also when I had spotted the runaway. Last time was more of a hassle, but I was also growing around 30 plants. I didn’t flood the house, but I did end up chronically overwatering a few of them.
That’s when I realized how little moisture the plants requires in the medium if it is given a continuous supply. It seems like if you’re watering once a day, it doesn’t hit that sweet spot until close to the next watering. If you’re watering multiple times a day you’re probably keeping it too wet unless your medium dries out really quickly.