Water leak detectors

Here are some good water leak detectors I found in my research:

• Shelly:
  • About $29 per device: https://www.shelly.cloud/en-us/products/shop/shelly-flood/4xflood-us
• Govee:
  • One way:
    • 3 sensors + hub is for $45: https://www.amazon.com/Detector-Wireless-Notification-Security-Basement/dp/B07J9HZ5VN
    • 2 more sensors (if we need) is for $23 more: https://www.amazon.com/Govee-Wireless-Detector-Basement-Apartment-dp-B07JB84351/dp/B07V4R16HX
    • So, total $68 for 5 sensors and a hub.
  • Another:
    • 5 sensors for $42: https://www.amazon.com/Govee-Detectors-Wireless-Detector-Sensitive/dp/B07QSFRSJX
    • 1 sensor + hub: $13: https://www.amazon.com/Govee-Wireless-Detector-Basement-Apartment-dp-B07JB84351/dp/B07V4R16HX
    • So, $55 for 6 sensors and a hub. Or $65 for 7 sensors and a hub.
  • One potential problem is that the hub may not cover the entire house. Says 100m but the number would be less when there are walls and floors in between.