All the Destroyers listed in the article definitely have 1 or 2 CIWS on board. I'm confident that would do the trick -- having seen them in action.
Additionally, each of those Destroyers have 7 (if I recall correctly) .50 caliber machine gun mounts around the perimeter of the ship, which could also probably handle the drones.
Additionally, each of those Destroyers have 7 (if I recall correctly) .50 caliber machine gun mounts around the perimeter of the ship, which could also probably handle the drones.