ProfessorLogicMonitor itself will take care of most of that for you and you don't normally need to worry about which collector is going to be used. Make sure that the AppliesTo covers all servers you want to check against and that is all you need to do. When you add a Device/Resource to LogicMonitor, you assign each one to a Collector or Collector ABCG. Anytime you run a check or script against that device, LogicMonitor will automatically look up what collector is assigned to it and use that collector. You don't need to tell it what collector to use each time.
Ignore what I said about ##HOSTNAME##, you have that covered by the "hostname = hostProps.get("system.hostname");" line.
