I have my collar attached to the freezer. I used silicone caulk. I also considered attaching the lid to the collar, but decided that I didn't want that extra height of the collar swinging back into the wall behind the freezer. And I figured I'm already lifting the keg over the top anyways, what's an extra 6-8 inches? You can always use a stool. Either way works, just depends on your personal preference. How many kegs can you fit in that freezer? It's a decent size for sure.