I dunno, Ive heard theres advantages to the 6x9 parcel shelf thus why Calais use it because it sits much higher then the door speakers it supposidly projects the sound better. I did once start to do it to the VX and agree, its alot of stuffing around, then again so can feeding the new speaker wire through the little rubber hose thing between the doors.
Im still tossing it up whether to just replace and amp all 4 door speakers, or just replace and amp the front speaker, add parcel shelf speakers, and just leave the rear door speakers alone. At least if anything happens to the amp like it overheats or gets bounced around a bit too much I can still hear music through the rear door speakers.
Im just concerned coz I was in a car thats had thousands spent on its audio system and the damn amp overheated 5 mins into the journey. Boring ride after that and I figured I might need a plan B in my car ...