@Joey Hess What is the accuracy spec for these probes? Or what is the device, so I can look it up for myself?
It seems to me that in a sealed area like this, there is likely to be some top-to-bottom temp gradient.
I suspect it would be fairly minimal, except for periods after lid openings, or when a larger heat load is added. But it would be nice to know.
I have a thing about 'degree': in this case, the question in my head is not whether the freezer will be warmer at the top, but to what degree.