Buggies for small boots.

Hi, it's really early days (7+3) but I feel like this might take a lot of time to find. Has anyone found a useable buggy that fits into a small boot? Mine is 96 ×30 at its opening (Volvo c70 cabrio). Really don't care what it looks like, all about the practicality.

On a similar practical note, did anyone find nightmares of incompatibility with car seats? My "impractical" cabrio can take a wide range of isofix etc, but the husband's "practical" Audi estate doesn't even have Isofix. So recommendations here also welcome!