The Mazda soft cargo liner is durable enough for luggage, potted plants, tools, dogs, or most any other cargo. And it is water proof as well. It is a sensational product which protects both the horizontal and vertical sections of the cargo area.
In my opinion the only need for the hard rubber heavy weight liner is when carrying snow or ice covered item, because it has raised edges that could contain the subsequent water. A couple of negatives to the hard liner is the extra weight as well as the capacity reduction of the two corner pockets. When the hard liner is installed it reduces those two pockets size by about 15%.
To answer your question, the hard rubber liner will fit on top of the soft liner, no problem.
I have both of these Mazda CX-5 liners, but will only use the hard version for snow.
Howdy DG_1234
Thanks so much for the reply and info, I guess I've always been
extra protective of things, always had trucks so even had a bedliner
with a tarp over it. I know, I know, but just can't help it !!!!
Take Care,
CK