My car is now 22 years old, and the sunroof has never leaked. Even if it did, that's 22 years of enjoying the outdoors while driving, and a quick way to let heat out of the car during the summer.

As to leaks, I think your brake lights have gaskets that can allow water in the trunk area. Other than that, make sure your trunk lid seal is free of debris; that can divert the water into the trunk.