I have this car seat, Henri loves it and so do I. I also found a way to use it without it having to wrap around a seat, I put Henri is the backseat and there is no way to make it wrap around, but I found a way around it.
Amazon.com: Kurgo 00044 Skybox Pet Booster Seat:...
I don't have a stroller for Henri, so I don't have any recomendations to give
I have always wanted to try one though.