Fitting Text box to styles

Hi all. Sorry for the clunky title, I didn't know how to summarise. I've redesigned a price box in a document using paragraph styles (see image), where the strokes and fills are determined within the styles rather than one box with a white stroke on top (as it was). These price boxes should snap to the bottom right of all items on the page (like the top example). However I can't get it to snap accurately as the overall shape doesn't really fit within the frame. I'd like the stroke/rows to all fit perfectly within the text frame so I can snap it perfectly. Any ideas? Thanks.