If you are marketing in Missouri you want to sound like you are from Missouri.
Missouri
How do you say '40,' 'here,' and 'wash?' Dissecting the particularities of the St. Louis dialect
https://news.stlpublicradio.org/show/st-louis-on-the-air/2016-12-21/how-do-you-say-40-here-and-wash-dissecting-the-particularities-of-the-st-louis-dialect
Why do people from Missouri have such strong Southern accents?
https://www.reddit.com/r/missouri/comments/iv0wji/why_do_people_from_missouri_have_such_strong/