You do not have to set up at Impact Fix to be a "Hitter." Impact fix is something that can be found in warm ups before a round and for most advanced/Pro golfers, Impact Fix has been well established. I use Impact Fix several times during a round as a double check and when I practice.
BUT.. a “Hitter” can set up in adjusted address with a “Hitters” hand position- a straight left wrist and bent right wrist.