Today I added the Sonof TH Elite smart temperature humidity controller to my freezer
Behind the top drawer is the original temperature sensor
Behind the middle drawer was an unused position for a temperature sensor.
And so I drilled a hole through the back of the freezer and mounted the DS1820 temperaure sensor.
The cable simply comes out of the back side, behind the heat radiator.
And the sonoff I screwed on the insulation material. It still doesnt control anything, it just measures the temperature.