The heat panel was a pain. I had to get smaller screws from Home Depot. Then I put the panel on top of the cage where I wanted it and drilled small pilot holes through the cage where the holes are for the screws in the panel. Screwing it in was a HUGE pain because I kept losing the screw in the panel itself and would have to fish them out. The screw hole in the panel don’t have walls down the side if that makes sense and it’s anout an inch into the panel. So you can lose the screws inside the panel if not careful. That was the hardest part about setting up and took me an hour.
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It did arrive fully assembled and safely packaged too.