The Petego EB K9 Keeper attaches to two headrests so it's often fine to use behind the front seats, if you have headrest posts for it to hook onto. The guard adjusts from 25cm high (with the top bar removed) by 85cm wide to a maximum 49.5cm high by 150cm wide, so you would need to check these measurements with the space in your car.
We also have a mesh barrier that fills the space between the driver and passenger seats.
Dog guards and cages