I mounted my controller where the factory control used to be.
Then ran the temperature senser though a hole I drilled at the hinge area.
My setup is; no collar, I open the lid on the keezer and dispense with picnic taps, good but...
At first i had the senser too high in the freezer, every time I'd open the lid the compressor ran.
So I ran it down lower and tucked it in the corner, now much better.