Better products are available
The square tiles you show were put in during the 60s/70s and are the same type that people put on recreation room ceilings or gyms. They work very poorly because they are too thin and too light weight. They provide poor damping at high frequencies, and virtually no damping at low ones.
If you are going to all the trouble of replacing or adding sound conditioning to your engine room, I would suggest you look at some the newer products currently available. For example, there are panels you can buy for damping home theater rooms that are quite reasonably priced and easy to work with.