Line Lock Question

My previous duster i was using the Hurst with a button mounted on the floor shifter,you can also mount the button on the steering wheel ..it never failed me,and another good thing about the Hurst is they're rebuildable...you want to lock the front brakes,so the rears spin to heat the tires up,but i've heard of people setting it up to lock the rears,so they can stage the car at the line,i prefer to just footbrake it...