Because of their shape, sound bars are perfect for placing in front of your TV. You should get a good stereo “image” and reasonable surround-sound simulation in a room of 4 to 5 metres square. (Your viewing and listening position should be no more than a few metres from the TV screen and sound bar.)
Tip: Sound bars won’t work if you have large open area. While it’ll still give you good sound, the virtual-surround-sound effect will be less. A subwoofer should give you decent bass sounds.