You can feed a single prey item or multiple the choice is your however if feeding multiple it is recommended to do it in one sitting as digestion takes it's toll on the snake, or do it 5 days apart if you want to feed twice a week,
2 things here
First no adult BP requires anything close to a adult rat which is usually 400 grams, animals 3000 and 4000+ do not require anything larger than 150 grams/175 grams rats.
Second if your BP eats 6 hoppers it is nowhere near and adult rats as far has food goes hoppers are 7 to 13 grams on average each and used to start babies out of the egg. So 2 adult mice would be the equivalent of what you are currently feeding.
Please keep this in mind when trying to give advice.