A lot of it depends on the car that you are working with. A lot of times kick panel mounting is a great way to go, my front stage is in the kicks i have a very wide stage width my height is right on top of the dash the only thing i lack a little of is overall depth. the first thing you need to do is measure from your listening position the distance between the kick panels and your head then measure the distance between the a pillars and your head and figure out which will be closest in path length. Remember aiming is going to be key either way you go and get a good signal processor with time alignment.