Both drawers get a Krisp. Ethylene builds up in the fruit drawer because that is where it is made, and in the vegetable drawer because that is where it does the damage. One case on the side wall of each drawer; swap the sachets on the same day.
High humidity (vent closed) Krisp 1
Things that wilt: lettuce, romaine, spinach, kale, broccoli, cauliflower, cucumbers, peppers, carrots, celery, green beans, asparagus, fresh herbs. These are the produce ethylene ruins first.
Low humidity (vent open) Krisp 2 Producers
Things that rot: apples, pears, ripe stone fruit, grapes, melon. Apples and pears are strong ethylene producers; keep them here, away from the greens, with the second Krisp case pulling the gas out at the source.