Buy the owner in Mount Juliet by drive time, not by a circle drawn around Broadway
A radius around downtown treats Green Hills and Mount Juliet as the same purchase, and your maintenance schedule knows they are not.
Start from operations. The real constraint on a management firm is how far a technician can drive and still make the day work. Build campaigns around the counties and submarkets you can actually staff, then set bids to match how badly you want doors there.
Davidson County behaves as one consolidated Metro government while Williamson, Rutherford, Sumner and Wilson do not, and the owner profile changes with it. An owner in Franklin comparing firms is a different conversation from an owner with a rental in Donelson. Separate campaigns let you write different ads and read different numbers.
Use location of presence targeting rather than interest, and check the location report often. Broad geographic settings buy clicks from people who are curious about the city rather than owning in it.
Where you cannot service an address, exclude it outright. A cheap click from a county you will decline is not cheap.