You might need more than six tubs. While most ball pythons lay around 5-7 eggs (sometimes less), ball pythons CAN lay up to 12 eggs. What size are the tubs in the rack.
We are asking a lot of questions because breeding just isn't something you decide to do one day. It involves a lot of research, planning, preparation, and patience. You need to make sure you have everything ready for your hatchlings when they arrive.
Do you have an incubator? Do you know what temperature to incubate at? Do you have vermiculite or now how to prepare it?
What happens if your female becomes egg bound? Do you have the money to take her to the vet?