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undercoating isn't really going to do much and may do more harm than good if they plug up drain holes.
Rust is going to happen in a salt + water environment. But what I'd be more concerned about is allowing snow to remain in contact with the car (either on top or below or beside) for extended periods of time. The melt + freeze cycle day to day causes ice to form where it shouldn't and keep water in contact with inside unprotected metal for extended periods of time.
Your best protection is to just make sure once it's done snowing, you wipe it off so there's nothing/not much left to melt and then later freeze again as that meltwater goes into the drain areas of your car. The rest is pretty self explanatory and common sense when it comes to dealing with snow driving.
Also, making sure you're not tracking in full shoe size encrusted amounts of snow and ice + salt to melt on the carpet and sit in the car and change your black carpet to grey. Wet carpets will do lots of rust damage to where things like seats bolt into the floor as well as seatbelts and this will tend to be where you see the start of floor rot over time.
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