You already have the advantage of a flat spot to swing from and you can set up your tee to any height you choose. Tee it up too low and you will not allow the ball to find the sweet spot in the driver - too high and the driver can pass under and you'll sky the ball.

Tee the ball so it will find the middle of the club when you swing through. That will be different for each of you since all drivers are different sizes. Once you know your height do it the same every time. Don't keep adjusting it.

Source: Free Golf Tip Newsletter Number 35 of 52