Freezer Q.

So I asked the internet and it was useless. Have an small upright non frost free freezer that probably doesn't have enough stuff in it at times, lots of ice builds up at the very top. Is there a certain way I should stock it? More or less at top?
It's just shelves evenly spaced.
Thanks
I have the same freezer with the same problem. I’m sure it’s caused by warm air when opening it. And it’s a PITA to defrost.