i know this isnt the answer you want to here but the solution is a 2+2.. Its girlfriend/wife friendly. 2+0 isnt going to work. I know this is wrong for me to say and I'm sorry but generally speaking don't listen to womens advice. Especially when it comes to cars.
Its illegal in my state to put a car seat in the front seat. I dont know what the law is in your state but if you got cought with a child seat in the front and a kid in the back of a 2+0 they would take your kids from you and throw y ou in jail where I live. So maybe not best idea I think that is the law in every state bro..
my 2+2 came with the book theres a page in the book with instructions on how to rig a car seat up in the back seat.. apparently you stick a tether strap trough the seat and there is a place in the trunk it can hook to. the rear seats do have pilar mounts. just becasue you are a fellow z guy and i dont want ur woman to make u get rid of it ill scan the book section for you. here I took a pic for you
2+2 ftw
