Installing RAC is a lot like installing the BladeLogic agent. First you install it manually, record the steps into a response file, then use the response file to repeat the process.
You can see what a response file looks like here:
In my opinion, the best practice is to do the following:
1. Turn the response file into a BladeLogic configuration file
2. Create a custom property class with properties which correspond to settings in the response file.
3. Associate the server class with the customer property class from above.