I have the Diamond Back HD on my 2022 2500…no drilling looks and works great and so far has been waterproof.I have the diamond back on my 2021 2500. No drilling required.
I’m curious if Undercover is another brand name for BakFlip? It looks like their MX4.I have an Undercover Armor Flex that has worked out pretty well. Everything in the bed stays dry. The clamps weren't super intuitive when installing but once I figured out the correct channel on the rails to put them in went on no problem.