The setup is ambitious as it’s complicated. To run a gambling ring successfully you need the right person for it. Shot-callers will bear the onus of the entire operation and potentially reap the fattest benefits.
They are the people who can keep their cool in difficult situations and understand how law enforcement works to counteract it. Once the right person is in position, he or she can then run through the rest of the details.
Sometimes a person would operate on their own if they have enough contacts and manage to keep customers coming back and interested.
Yet, most rings operate by creating a group of trustees who help manage the operations, accept bets and make sure to stay away from the public eye.
The organization’s HQ is not as important as long as it doesn’t call attention to it. Sometimes, a ring could just as well operate in prime venues precisely because nobody would suspect.