This is a plumbing product from the perspective of a guy who does not fix plumbing. I'd rather spend $40 on three sensors than find out about a leak by stepping in it two weeks later.
Govee's WiFi leak sensors sit under every appliance that could leak — water heater, washing machine, dishwasher, bathroom sink, refrigerator line, furnace condensate. When the metal contacts touch water, they beep at 100dB and push a notification to your phone. You can be on vacation in another country and know within seconds that something's wrong at home.
I've had one save me twice: once when a supply line under the kitchen sink started weeping, and once when the AC condensate line clogged and water started backing up. Both were $50 fixes if caught early. Both would have been $5,000 in drywall and floor repairs if caught two weeks later.