I did not secure the dehumidifier in the cooler, it just sits with the pointed ends of the fins in the drip channel at the rear of the cooler. Here’s a pic of the bottom tray cut for the dehumidifier.
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There are several posts with suggested setttings, but if you are putting freshly harvested bud in, no pre-hang dry, i remove all fan leaves and most larger stems out first, then start at 55f and 78%rh, and drop rh by .5% per day the first few days to a week, then 1% per day until 60% or where I want it. That’s a good place to start, once you see it run a few times you can adjust from there.