Boundaries are your walls, floor, and ceiling.
You find your first reflections by using a flashlight (laser even easier) at the seated position, and have a second person hold a mirror on the wall. You keep the light targeted on the mirror, while moving the mirror along the wall until it hits the speaker. You can do it the reverse of course, from the speaker to the LP. It's like a bank shot in a game of pool for instance.
OC 703 at 2" is going to do little to nothing for bass. Most rooms have their primary issues with bass. Dealing with bass and midbass can be beneficial for your HF too, because over bloated bass modes can actually cover up or "mask" your HF stuff. This is very related to trying to stay away from the back wall.
Therefore, since your panels will have a rather negligible effect on your bass, I would set everything up as well as I possibly could without even thinking about the treatments at all. If afterward you find that you still have a bit too much HF issues, or some slap echo or anything, then you can find spots for your panels. You could buy or make beefier panels for your room, if you feel you need it, then use your existing panels for something like the ceiling. Use the mirror method, but get a step stool/ladder. I used pieces of tape to mark my spots.
For your TV viewing distance, personally (as this has very subjective elements involved), I think one should be close enough to at least enjoy the full resolution of 1080p. However, THX would recommend an even more immersive angle than that. I can't tell what size screen you have, but if it's between 42" and 50", I'm going to pretend it's 46". I would sit no farther than 6' away, and keep scooting the TV closer to me until it's perfect for me. Of course, it's hard to get everything perfect, and you don't want anything to look awkward, and that's why you are setting it up, and not me.