The
DW 9000 is a single pedal.
Thw
DW 9002 is the double pedal.
45 against the head and 21 at rest position is the proper way to go.
To get the 45 you need to adjust the bass drum parallel to the floor. Then work out the rest with the pedals alignment.
If the Bass drum is not parallel to the floor, you will loose some acoustics.