Water sensor alarms.
If you have any doubts about the pipes in your house or have a feeling that water might enter your basement, sensors will help you sleep at night.
Water damage to your home is no joke. I know two separate homeowners who have had leaks from their refrigerator’s plumbing (water and ice dispenser). The damage for each homeowner was quite extensive given how small the leak was.
In one case, it was under warranty but heavily disputed and it took a lot of posturing to get the work done.
In the other case, insurance took care of it, but flooring that would have been covered by insurance would not match the rest of the area, so the owners decided to renovate a lot more than they wanted to.
To me, the pain of having to live through the repairs/renovations is enough to make me vigilant of water leak issues.