I did one of the Samsung sound bars a few weeks ago for the first time in a bedroom.  It's a nice improvement over the TV speakers without the expense of a real solution.  I'd do it again for a low-budget secondary TV.

I used a Levition recessed entertainment box behind the TV.  This gave me a spot for a duplex outlet to plug in the TV & soundbar and also room to bring the AV cabling in from sources that are mounted in a closet.

The soundbar mounted up close to the bottom of the TV (even though the manual says not to do this) so the power and toslink cables aren't visible and the extra was coiled up into the Leviton box.  There's another cut-in box behind the edge of the glass table so I could drop analog audio cables down to the wireless headphones.