Typically, gutter mounts are stronger than where the "luggage rack" mounts. On most vehicles, Monteros included, the gutter/drip rail is actually where the roof and sides of the vehicle are joined together, a lot like the lid of a soup can. On newer vehicles, that joint has moved up onto the roof- usually covered by some black trim. If you just prefer the looks of it mounting up top, then you can always look for an unfinished rack and have any decent fabricator make feet for it.
For those of you that fabbed the hinges to the drainer in the pic a above.
When the door is closed, does it leave any gap? I'm just curious how it will look when the door is closed on Montero since it has a door reveal rubber around it.