How can i create a 90 days plan (3 months) with the last month being free, and at the same time preventing customers from paying using installments

1- Create the plan
2- Create a new voucher that supports only this plan
3- Add the required discount percentage (33% of the total 3 months price) so the last month would be free
4- Disable “Supports installments” option, so when using this voucher, users won’t be able to use tamara/tabby
5- Enable “show at checkout” option