I have it attached to the backside of the ladder. I'll try to take a pic the next time I'm out there.
I just used a piece of waterproof gorilla tape to attach it.
I put the sonoff in a waterproof box and used an extension cable to run the sensor over to the pool ladder. The swich part of the sonoff goes to the heater.
The Tp Link dual outdoor plug powers the interior pool light and the pool deck lights. And the Aeotec runs the pump
