Adding woocommerce flat rate per shipping address

Hi, I hope someone can help. I’m using woocommerce and I want to sell postcards that allows buyers to add text and then let them send to a few different people in one transaction. I installed a couple of plugins, one to allow them to add a note to the chosen postcard and one to be able to have multiple shipping address options. My issue is I want to charge £1.00 postage per shipping address. Is there anything I can to to set this up?

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