Did not know that, although I just figured there's only one way to set it up. Good to know there's a right and a wrong way to do it.
A pool noodle would work, especially with a low profile one that leaves more space in the backseat.
I want to put a harness in my car, but I need the backseat as well. I was leaning towards a removable setup that can be installed and removed in about a half hour, but knowing that there is a right and a wrong way to set up the harness makes me question it now. I don't really need it, once I move I'll just be going to a few auto-x events.