I'm looking to set up a DIY surround system in my living room. I'm not much of an audiophile and am not going high-end, but might as well get the best setup I can. We've decided freestanding is not an option - there's too much human and dog traffic behind the couch, they would get kicked or tripped over too often. At the front I can do a pretty decent setup, but for the surround channels I have three imperfect options, as shown in the attached 3D model of my living room. Option 1) A near-perfect position in-wall just behind the couch. But, the left speaker would be covered by a canvas print. I'd be counting on the receiver's calibration to handle whatever attenuation that causes, and I don't have the experience to know how well that will work. (The receiver I'm considering right now is a Yamaha RX-V477) Option 2) In-ceiling. Here I have fairly free reign and could position them pretty much wherever. They're also the easiest option for me to install, due to access from above. But ... my understanding is that in-ceiling is generally not preferred. Option 3) External speakers hung in the back corners. They'd have to be small (probably only 4") because they'd jut into doorways, as you can see in the picture. Any advice is appreciated!