Make sure to get a dash cover that "breathes". If you trap the heat under them, it's like not having one at all.
Some dash materials are pretty good in today's cars, but I can tell you the 2007-2013 GMC/Chevy trucks all had a dash crack problem that was rampant. Maybe not every truck in the world, but every used one I looked at that I could see the dash had a crack. Hard to find one used that hasn't had a crack near the upper LH corner at the passenger air bag insert. I had one of the best covers in my old truck right off the bat and STILL had it crack, replaced under warranty, and it cracked again, I took the dash out and did a plastic "weld" and epoxy repair on it from the back side...and while still using the cover, and it STILL cracked again later on...fugg it. Chalked it up to a junk design. Plastic is way too narrow in that area IMO. I just lived with it.