5 Potential clutches even at an average of 6 eggs, is 30. So a 16 tub rack isn't going to cut it. Also, you have no idea how long it will take you to sell the animals you don't intend to keep. It may be a better idea to build your own that can accommodate at least 30 hatchling tubs but can be swapped out for larger tubs later, even if they have to go in sideways.