Just installed a Moen FLo with 6 remote sensors. I also have it plugged into a UPS battery backup ($60 on amazon). The application is nice as I can see if any thing is runnig, water usage, pressure, ... You can also shut off remotely or it will do it thru the sensors or if it thinks there is an issue. I have not tried this but if your router stays up (ups backup) even if your internet is down the sensors should still trigger using the internal network.
https://www.amazon.com/Moen-900-001-...115067152&th=1