I don't see why renting space for your grow won't work. There would have to be a copy of your MMJ authorization on the premises and I would tag every plant that is yours with your name. You would just need to be careful what you say to leo if they showed up. Never call the person your renting the space from a caretaker. Because a caretaker can only have plants from one individual. Make sure you tell them that you do all the nutes and pruning and everything else yourself.
But as we all know the laws are vague and if a cop wants too he can just pull everything up and let you argue with the judge.