Monoprice has the Monoprice Universal Floating Soundbar Mount Bracket (15265) on sale for $10 - 15% off with coupon code MARCH15  [Exp 3/19] = $8.50 with free shipping.

• Uses VESA mounting (200x200 to 600x400) to mount a sound bar (up to 22lbs) above or below your TV.
• Could also work on a center channel speaker, depending on weight / size.