I have used Gorilla hang-on's for a long time, and also have some that I've welded up on my own. Like others have said use 2 straps, but loosen them when you know you're done for the season.

Personally, I like to lean back into the tree just a little. It's a comfort thing. All of my stands have foot and arm rests on them, as I often do long sits and want to be 100% comfortable.