The really nice thing about using my quilting frames is that the whole thing is really tight. I pull all three layers snug and put in the first pins on opposite sides working back and forth to start. Our neighbor, George, used to tease us and threatened to use our framed quilts for a trampoline.
Then we put in ties or pin basting. There never is a wrinkle in the back.
When this is set up in my kitchen, I sometimes tell my husband that the easiest way to get to the other side is to go out the back door, walk around the house and come in another door. LOL