no one puts crossovers inside doors, unless they don't know what they are doing - they shouldn't get wet. Honda and Toyota have styrofoam near the latch side that can be cut out to house crossover in a dry environment between the door and panel (assuming you close up the doors since the styrofoam can protrude into the door cavity. they should be mounted by the amp, ideally. under front seats is a decent option. glove boxes, under dash, etc. also work. if they have settings they should be accessible.