IMO, nearly all angels are some threat to corals. The majority of individuals of any given species may be fine, but there is still a risk. Knowing how hard it is to get fish out of an established tank, I would consider the worst case scenario before adding any fish.
The real issue again is that it is a hex tank and not rectangular. A standard 45 woould be a 3' tank, and more suitable for the dwarf angels.
But once again, having been attacked by gold striped maroon clowns in FAR larger and wider tanks, I would say that you are going to be quite limited.