The clientAddr portion applies uniquely to GenieMinis. It has nothing to do with controlling multiple "receivers" (unless you're referring to the clients as "receivers").I do have the 1.3C but before http://www.satelliteguys.us/xen/members/gerlin.189421/ 's hint about the clientAddr parameter I had no clue about how the Genie/Whole home things could works.
Maybe it would be useful to use the model numbers of the equipment so the client vs receiver issue doesn't enter in.