I am attempting to mount a device by screwing into ~2" of rubber (not sure what durometer or material, but it is decently firm, maybe 70 durometer). However, I am not sure what type of anchor to use (corkscrew, wall-anchor type, ground anchor, etc). Shown below are some examples:
What are the advantages/disadvantages of each for soft materials? I assume since the material is closest to a cork, a corkscrew would likely be best (assuming there is sound reasoning behind the design of this ageless device). The worst case scenario is if the fastener tears out, and pulls out a chunk of the material along with it. I would think a helix would minimize the risk of damage, however the lack of surface area might not provide the most shear strength/holding force.
Is there a guide, or published paper, discussing the tear-out strength of these fasteners in rubber/elastomers?
EDIT: As per the comments, here is some additional information: The rack (with measurement equipment on it), is ~100 lbs. Unfortunately, I do not have access to the inside plate, or other side of the rubber layer. This is also a temporary installation (hence screws), so I cannot bond to it (epoxy), which was my initial thought.