Here is where they stay in the back, has a soft padded floor and no thin wire / sharp edges like some other cages. Fits the CT perfectly too: https://www.taycanforum.com/forum/threads/dogs-transport-in-ct.6087/They are more than happy up back, the car is so smooth on air suspension, just need to remember not to accelerate too hard! I have a small cage for them that fits perfectly in the CT. It stops them rattling around too much and when inside they just sleep. Also purchased a foldable cover to protect the tailgate that attaches to the boot floor by velcro. Will post photos when I get home.
I have now added a simple tailgate protector, close to perfect fit. Velcro's to the floor at one edge that allows the compartment under the floor to be accessed. Folds back on itself neatly and covers the tailgate nicely.