Looking for a receiver to put on my patio. Looking at denon. That's what I always buy. I will be installing two polk in ceiling speakers but also have two other outdoor speakers. Why not install all four right? I assume I would use the front left / right and side left / right connections on the receiver. I was looking at the S540BT $279 but then I was curious about the S640H $379. They say you can control it with Alexa and a Heos App. ? Anyone know how that works? Does that require additional Heos equipment? Would I even benefit, does it still require an Alexa device or has the software built in? I would likely place this in the enclosed ceiling above the patio. Any advice please chime in.