I just took my Excal and used my daughter as the tree. Assuming you were sitting in a typical portable stand where you cannot get away from the tree, I would be comfortable shooting in about a 220 degree arc with my Excal. My Parker compound would be a bit more with its much narrower limbs.
The diameter of the tree and the size of your platform would alter that estimate of course.
From a double ladder stand with my Excal had a deer straight behind me.I faced the tree and had enough room to pull up the bow, lucky for him it was a small 4 point(3 on the left and 1 on the right).My saftey belt was tight and my sturip was about 10" from the tree(had to lean back a bit).Love my Equinox!!