This is a challenge. But here's a solution with no holes in your walls, or fishing speaker cables.
Grab 5 Monoprice MP-65RT 6.5in and Ribbon Tweeter 2-Way Bookshelf Speakers They are sold by the pair, so you'll have to contact their Sales Department for 5 of them. 5 should cost about $125. Place all of them vertically at ear level when seated including the center one behind the screen.
Monoprice MP-65RT 6.5in and Ribbon Tweeter 2-Way Bookshelf Speakers (Pair), Black
For $60 each get two Monoprice 12-Inch 150-Watt Powered Subwoofer Black (Open Box)
Monoprice 12-Inch 150-Watt Powered Subwoofer Black (Open Box) Do the Subwoofer crawl to determine optimal Sub placement.
Use the remaining $55 to get some speaker stands off Craigslist /eBay, and / or mounting brackets.
I hope this is helpful.