I lived in Baltimore as a landlord for a few years, and have some advice for you.
Local tenant screening companies are just as good as nationwide companies. They all provide the same services, the only advantage might be impact on small businesses in the neighborhood.
When in Baltimore, I used a few services that I wasn't fond of such as my rental, smart move, etc. After I left, I found a new program called TenantMagic, that is a local tenant screening service in 2017 in Cleveland. However, they are a nationwide service that is better than anything I used before in Baltimore. I attached the link, and I would check it out, but certainly let me know if you have any questions about anything in Baltimore!