@jbrock i have seen and used those cleats. They are not my first choice. One - orientation. The jam portion for a halyard (that would be the end to the right in the picture) needs to be facing down. It will help to raise the sail. Once the halyard raises the sail to the proper height the halyard is tied off with a standard figure 8 cleat knot.
My dislike is centered around the jam part. A halyard is intended to be quickly released when needed. The jam can jam the line when under pressure. This may endanger the crew or boat in an emergency.
Instruct the crew about this risk and practice loosening the halyard and pulling down hard with the halyard to release the jam at the marina when it is calm. That way in the event you are in high winds and working the halyard the training will kick in when needed.
Good luck.