water supply line to toilet and refrig are two common ones

that cause leak and leak mitigation company makes a lot of money. 

1. change supply lines every 10 years? Those rigid ones are bad. I had a flex one that broke at the connector and flooded onto the 1st floor. 

2.  cloth washer is another risk. try Universal Anti-flood Aqua Stop Appliance Hose https://www.youtube.com/watch?v=CI1X5yAmrBo

3. have plumber inspect kitchen drain pipe every few years. (I am dealing on drain leak in subfloor and crawal space)

I installed xiaomi water sensors and alarm gateway but the software update makes them useless. 

Leak detection systems work by monitoring water flow through either a mechanical turbine or ultrasonic wavelengths. These leak detection systems observe the pattern of the water flow, either by counting the gallonage passing through the sensor or sonically recording the time delay 

https://www.freshwatersystems.com/blogs/blog/leak-detection-systems#:~:text=Leak%20detection%20systems%20work%20by,sonically%20recording%20the%20time%20delay.?

 

Has anyone used this  antiflood ?

https://www.youtube.com/watch?v=pz5WtNGaBd0

 

https://www.lowes.com/pd/EASTMAN-6-ft-L-3-8-in-Compression-Inlet-x-3-8-in-Outlet-Braided-Stainless-Steel-Dishwasher-Connector/1001315226