If indeed you mount the X~over there...You also have to consider moisture in the doors could in time have an affectI manged to find a spot to mount the crossover in the door so all that needs to be done now is find the factory speaker wires inside the car -- hopefully where it comes in at the loom/boot splice the wire and run it to the amp.
well, mine are mounted in my doors with industrial strength velcro (do not use duck tape it fails over time) and one was even lying in the bottom of the door in a puddle of water (before I upgraded from duck tape to velcro) and they both still function 100%If indeed you mount the X~over there...You also have to consider moisture in the doors could in time have an affecton those X-overs.And another factor(Possibly) could be the shutting of the door causing loose connections inside the X-overs?
Maybe I'm wrong,which would be good.It would be ashame to do that...and have the X~over S*it the Bed/.
All The Best/
Raymond