There is a recommended position for centershot, which is to adjust the rest so that the inside of the shaft lies just outside of the centerline of the bow. The tailgate of a truck works well for this. Prop the bow against the tailgate with the bottom limb on the ground on some kind of pad so it doesn't get scratched. Nock an arrow in the bow so that you can stand behind the bow and look down the arrow shaft. Move your head until the string bisects the centerline of the bow. Many bows have a limb bolt or something you can use to locate the centerline. If not, put a piece of tape on the limb and mark the center. With your eye in that position, the inside edge of the tip of the arrow should appear to lie on the string. Move your rest in or out until you reach this position.
Some bows are not cut past centershot, and can't be adjusted to be in this position. But if your bow can be adjusted to be in that position, it would be preferable to tune the bow to eliminate the nock left by reducing point weight, shortening the shaft, or changing to a stiffer shaft (assuming you are a RH shooter).