Well, an econ department doesn’t have to really “cater”. I suppose they could advise, but info can also be found in the internet. Basically, take the math that a good econ PhD program would expect, which can be found at any research U (as well as any LAC with a math major).
BTW, as @Data10’s data suggests, geography does matter. Many of the econ faculty at any research U in the same metro as a regional Fed will have connections to the economists working at that Fed.