I feel like I e heard only certain stores allow you to try out seats to see what fits in your car. Anyone know if BBB does that?

Bonus question, I drive a corolla. I read reviews that suggested the key fit for the tiny back seat. DHs BFF has offered us all their extra bases (we need 3, one for dH and two for emergency contacts for daycare) to the britax b safe. Anyone have experience with that one in a small car?

Thanks!