If you swap the Harpoons and Sea Sparrows, you'll be able to have the CIWS covering the aft half of the ship and the Sea Sparrows covering the front. Or, move the Harpoons aft, beach the Sea Sparrows, and put an ASROC box forward. Or, leave the Sea Sparrow box where it is, remove the Harpoons, and have an ASROC box launcher with mixed ASROCs and Harpoons forward.
As the main focus of these ships is ASW, an ASROC would be a nice addition to their capabilities even if it means the loss of their Harpoons.
Since this is an Australian ship, it will most likely carry Ikara instead of ASROC.