Can't keep on ready without commenting! Porsches come with similar jacks, and I agree are somewhat precarious.
Why not buy a nice Craftsmen floor jack, in its own protective plastic box, and store it in the trunk, in the right side depression? I have one of these, at US$40, plus or minus, because the side cladding on my Lorinser Aero prevents the use of the "factory" jack. The Sears floor jack, small and compact, is much more stable than anything around, and does not weight much, and avoids any such problems. And at US$40, this sounds like a good deal to me. And it saves undertaking costs!!!!!........Andras