Curiously, how many feet do you sit from that display? How wide is the display itself?
Try to borrow a pair of speaker stands. Have some file cabinets, or large stacks of books on hand as well. This way you can play not only with angles, but height as well.
With a very cursory glance, I say mount directly to the sides of the TV. Whatever mounts or shelves you choose, give them as much space as possible from the front wall. The light switch? I'll let you figure that out. (Do you mind that its hidden behind the speaker, yet still accessible to turn on/off?).
Good luck!
edit: I'd also be wary of a right-heavy soundstage if that wall is indeed a lot closer than the left wall. You can decide if treatment is a possibility, if that does become the case.