I was curious so I updated my Pro Control software and I tried it. You can't have more than one processor in a system.
I checked this by adding one processor, then remotes; as soon as one processor was added, that choice was grayed out. I then added three remotes and a processor, with the same result: only one processor was allowed. This was true for both r and z product.
A good answer is easier with a clear question giving the make and model of everything. "The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw