Thought I would post some follow up to my experience with the 5000SLX thus far...
As mentioned earlier, it works very well with my 981 Cayman...zero issues. It also works fairly well with our 84 M491 (widebody) when the 16" Fuchs are installed. A little finicky to get the jacks placed just right without tire interference or crushing of AC lines.
When I have the wider 18" RH wheels installed it gets a little more problematic.
My solution has been to add a couple of 2x8 yellow pine stretchers that cross between the jacks. There are some blocks screwed to them that fit into the pockets on the Quickjacks. This serves to set the width of the jacks correctly and keep them from sliding while positioning.
Using this setup I can hit the inboard points mentioned by member @mxtx and others yet still keep the rubber blocks above the QJ rails. It also gains about 1-1/2 of height at max lift without resorting to another (wobbly) rubber block.
YMMV of course. Not recommending this, just passing along my solution of dealing with the 981 and 3.2 widebody.
Aside from all that, I have been really happy with the purchase. VERY handy in the shop and I've used it on numerous vehicles besides these two "hobby" cars.
Highly Recommend!