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Flood/water sensors:

• Hot water heater
• Under kitchen sink
• Behind dishwasher
• Under clothes washer

Smart valve on mains water supply so you can automatically cut off water to the entire house if any of your leak sensors alert.

You could then call a friend or family member and ask them to check on it.

Or if you had it on a smart outlet you could try rebooting it.

If you live in a climate in which you need to winterize your outdoor faucets (e.g. by shutting a valve in your basement, crawlspace, or garage) a temperature sensor on the warm side of the valve can save you from a flood.

I had to replace the garage door opener one winter and failed to notice a new quarter inch gap at the bottom of the garage door. Combine that with a cold snap and the garage dropped below freezing for long enough to burst pipes.

Fortunately I had a Shelley flood sensor on the floor so I was alerted fairly early and was able to avoid serious damage, but had I been paying attention to the pipes themselves I could have avoided a plumber call-out on Christmas Eve!