Just remember that (to much) salt will also kill the plants. Put it around the pots and/or beds, not in them. Use plain salt, the cheapest you have, and put a nice string around the plants so that they have to cross is to get to the plant. Or try to cross it I should say... You'll have to pick the ones already inside your salt perimeter at night of course.
Beer will attract them, put out a couple of plates with beer and go harvesting marinated escargot in the morning!