It requires access to the space behind your burner knobs and room there to mount contact sensors, and a way to mount a magnet in the back of your knobs. Also needs small sensors to make things fit...so worked for me/my DCS cooktop, but not necessarily something that is generally applicable on other cooktop models/brands, unfortunately.
I'm currently using Aqara contact sensors as they are tiny, and have very long-lasting batteries, longer than the Visonic sensors you'll see in the photos that I was initially using.
If your wife is OK w/contact sensors attached to the front of the cooktop you could put a magnet in/on your knobs and attach contact sensors to your cooktop front, but that could look pretty kludgey....
