As mentioned above; you are going to have to experiment on your boat. Originally used on full keel boats, the fin keel and cutaway keel boats may not heave to as advertised.
Being hove to, or not making way through the water, does not alleviate you of the responsibility to keep a good look out. It is not an excuse to go below and sleep, and leave your fortune to fate, or to some watchstander, asleep on the bridge of his vessel.
"Any idiot can make a boat go; it takes a sailor to stop one." Spike Africa aboard the schooner Wanderer in Sausalito, Ca. 1964.