This is correct. If you transport a house fridge on its back/side you should leave it for a minimum one hour upright to allow the oil to drain back.
I can see no reason for a danfoss to be any different in a car fridge.
As a side note, an engle will run ok upside down. I know of one that was in a D1 which sat on its roof for many hours, fridge still running, many years ago and is still working fine today.
Not saying I would try it though.
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