Place your Floodie on the floor with the two gold contacts facing down.
Alternatively, you can use the adhesive pad to stick the sensor against the wall. Ensure that the sensor is sitting right against the floor with the contacts facing down.

Place it where you expect there could be a water leak or unwanted water such as near a water heater, laundry machine, water softener, floor drain, or window.

Note:
We do not recommend using the adhesive pad when the sensor sits flat on the floor since it will make the gold contacts sit too high.