You're lucky, I have, several times in Germany, where some dealers come with a ruler measuring them, plus km limits per day.
Enterprise's guidelines is
Bumper Damage IS: Dent/scratch larger than 6” (size of the damage evaluator), or hole/tear of any size
Exterior Body Damage (Non-Bumper) IS: dent/scratch larger than 2” circle, or hole/tear of any size
Glass Damage IS: Any ‘Star’/crack
Would you pay an extra $500 a month to avoid having to spend $1000 renting a car twice a year? Probably not, so the question is how much more does it cost to not rent the long distance car.
And I've never rented a car where a 1mm scratch would require fixing, nor a 1cm scratch