98Redline - there is an indexing mark on the nock for that very purpose. It may be hard to see in the photos, but it's there.

Also, the magnet is a lot stronger than you would think it is. It would take a pretty good bump/twist to get that sucker to move once you've put it on there and rotated it to the proper position. I could see it happening during a spot/stalk, but not likely from a treestand if your bow is on a hanger.