Here, add the player position command.
/set engageplayerpos *,*,*,*,*,*
1st and 4th are along the X axis, 2nd and 5th are along the Y axis, and 3rd and 6th are along the Z axis.
DO NOT EVER HAVE ALL THE NUMBERS ON EITHER SIDE MATCH OR YOU WILL DIE.
Unless you happen to operate on a cray.