I've seen quite a few tests and the outcome is always the same: The only viable (medium and up sized) dog transport option is the solid metal case, tied down to the trunks floor. An only solid, good variants of it. The crash tests have shown, that no "belt/leash" thingy or anything made out of anything else than solid metal bars (even the cheaper metal options) will get destroyed, at least the backside ripping up from the dogs impact, with a high risk to both dog and passenger in the car. If you love your dog and yourself or your passengers, you should shell out the money for such a case .. it's the only crash "safe" option.
Seeing the stingers low roof, I don't think that is impossible, but you won't probably find many standard, common cases and maybe require a custommade one.
(german vid as an example:
Sicherheit im Verkehr - TCS-Crashtest zeigt gravierende Mängel bei Hundegeschirr auf )