Build the account around where you can file, not around where you can advertise
Jurisdiction is the top level of the account structure, above matter type and above device.
One campaign per jurisdiction you are actually admitted in. The District in one, suburban Maryland in another, Northern Virginia in a third if you take that work. Each gets its own budget, its own location settings and its own ad copy, because the copy has to name the court and the county to work.
Matter type sits inside that. Divorce, custody, support, modification and protective order inquiries behave differently, arrive at different hours and are worth different amounts to the practice. Mixing them inside one ad group hides all of it.
Resist the tidy metro-wide campaign. It looks efficient in the interface and it produces a report you cannot act on, because a cost per lead averaged across Fairfax County and Prince George's tells you nothing about either.
The structure has a second benefit. When one jurisdiction runs hot and the other goes quiet, you can move money deliberately instead of watching an algorithm decide for you.