the Z32) you will notice there are paper like patched along the drivers sill. You can easily poke a hole in the them with a screwdriver and then use that hole to till the frame rail. Also along the frame rail towards front fender will be a grommet. Use that one to finish off the front frame rails. Don't start drilling holes if you don't have to. Also please be extra careful on securing carpet away from this product. The SCC stated this stuff is sticky...that is an understatment. This stuff stayed on my hands for over a week. It was impervious to gas, water, Gojo and acts of god. Seriously, prep before you spray.
But please don't drill holes for something like this. BTW- I managed to use existing holes even in the Camaro I applied it to. So there should be no reason for drilling and fubaring up everything.