I don't like the kind that hang on the seat headrest. They seem too flimsy & unstable (maybe just the kind I had....). I have the pet gear booster. I put it in the middle of the backseat so ZoE can see out the front windshield cos my car has tiny lil windows in the back.
This is the kind I have:
Amazon.com: Large Booster Car Seat Charcoal:...