GLSNightPilot,
You are exactly right, the relationship to the CG is what counts. If the Tail rotor were much higher than the CG, the roll attitude in a hover is less. That is why a centerline tail rotor helo has about 4.5 to 5 degrees degrees left roll, while a high tail rotor helo (S-76) has about 3.5 degrees.
Somehow, the idea that the height above or below the main rotor is important has been surfaced from time to time. It is not correct.
Nick