Wow seems like some extreme measures! How often are you going to be driving the car vs. letting it sit in said garage? What kind of vermin are we worried about--rats and/or bugs? Is this place known to have infestations of the sort?
Perhaps some mesh in the hoodscoop?
Maybe some roach/rat traps in front of your spot?
Or maybe carry around little snacks (i.e. cheese cubes) and put them under the cars farthest from yours?