Hawks don't normally bother corals, except for the occasional perching on them.
Most corals get used to it after a while, but some don't.
If you find a coral closed more then often because of perching, move the coral. Hawks are very predictable creatures of habit that tend to follow similar patterns, like obsessive compulsive hand washers. :lol:
Otherwise, it sounds like you have a great plan on planting your aquarium with corals.:thumbsup: