If your integrator is recommending this, and he feels comfortable with it, I would certainly take his advice. If you don't trust him, then you probably need to find a new integrator. HAI gives lots of training to integrators as well as provides support for them, so its not surprising that he would go that route. If you want something different than what he has been trained in and has experience installing, then you need to find a different integrator, but as others have said, I would be hesitant to do that unless you have a good reason.