Page 84 - Turkey Book from Meathead

You absolutely, positively do not want the bird sitting directly above the flame or coals unless you have always secretly wanted to run an avian crematorium. The meat and drip pan go in the indirect zone and roast by convection airflow circulating all around the bird rather than by direct infrared radiation from the flame or glowing coals. We do not recommend putting the meat and the drip pan in the center. It is too easy to burn the thighs and wings that way. Put the drip pan below the food grate. The bird roasts on the food grate above.
Here is how to set up a gas grill for 2-zone cooking:
Below is a 20 year old Weber Genesis gas grill. We have removed the cooking grates. The bird sits on a wire rack above the drip pan filled with the gravy fixins, and the drip pan sits right on the flame deflector bars. On the left is a