I’ve got Travall one along with boot liner and the divider in my 3 Series Touring. The divider is great as means can keep dogs in 1 side and other stuff in other part. It is meant to be set in the middle but a little bit of bodging means I have a 80/20 split which is great.
Used to have Trystrome cage in previous cars, custom built for each car and great though need careful assembly and again bodging with some rubber grommets to stop them rattling. Did have the advantage of being able to shackle it into the boot and leave the dogs in the car with the boot fully open and them still be secure.