A radius drawn from downtown buys clicks across the Mississippi you may not be able to file
The default thirty mile circle around the city center is half a plan, because a meaningful part of it is in another state.
Cross the Mississippi and you are in Illinois. Madison County and St. Clair County, the Metro East, run under an entirely different set of state rules. If you are not admitted there, those clicks cost exactly what the useful ones cost and return nothing.
Build the geography as a list rather than a shape. The City of St. Louis, St. Louis County, St. Charles County, whichever outlying counties you actually appear in, and the Illinois counties only if you are admitted to practice there. Admission requirements differ by state and are worth confirming with your own counsel before anyone writes ad copy about them.
Check the setting that controls whether the platform counts people physically present in your area or merely interested in it. The interest option sells you the entire country, and family law attracts a lot of idle interest.
Then report by geography from day one. Without that split you cannot tell whether the account is working or whether one strong area is paying for three weak ones.