Yes, but doors have a very nicely defined lower point without a whole lot of variation in the profile of the bottom bit. Even so, they rust out frequently, as the sibling comment to yours mentions, in part because they tend to be too small and get clogged, in part because the moisture running down the inside of the door can still sit on the level parts for a surprisingly long time, and soak into the sound proofing and between the sound proofing and the various metal door panels. Depending on how porous the paint is and how good the adhesive is it could get problematic (there was a time when car manufacturers switched to water based paints and cars from that early period after the switch tend to rust like mad because the paint was more porous).
Finally, keep the door rubbers at the top maintained well, the best way to deal with water is not to get it in there in the first place (but moisture from condensation is impossible to avoid).
