I would not buy a package of 18 eggs, I only buy dozens.
I want to say the four corners for symmetry, but lately I've been pulling them out right to left from where they are in the fridge door, so maybe 6 12 17 and 18.
I only buy a dozen, too. And I use two at the bottom and two from the top so the carton is balanced, and I'm not surprised the next time I pull it out from the fridge.