i have one of the dog hammocks in the back of our X3MC and it works great. easy to put on and off. Would be fine in a sedan too. I have not tried it in the Alpina because that rear is so much larger would need a bigger one.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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2019 BMW X5 50i Mineral White/Tartufo all options including M Sport
2022 Porsche 911 C4S Silver/Brown
2023 BMW iX M60 Black Sapphire/Amido, Titanium Bronze trim/22
2023 Audi RS6 Avant Daytona Gray/Black
2024 BMW X5M Comp Brooklyn Gray/Taruma Brown, Titanium Exhaust on order