Kevin, you could use the climber seat as a platform but if you had to lean out 90 degrees to it, your weight will push it around the tree.
James, I think a hanger up against the tree will work fine and probably be out of the way more than the Primos. I'm sure that's what Joebuck uses and he's the one with all the time hunting in this rig.
I would say to get up 2 feet off the ground in your yard and experiment with different setups to find out what works for you. It's alot like shooting a bow, not everyone will do it the same way. DB