Contrary to belief, you do not have to have a perfectly square room or viewing area with your seating, TV and surround sound laid out squarely.
However if you do have a non-standard layout, it is imperative that you make the most of the remaining space to offer the optimum available surround sound experience, whether you’re using a 5.1 or a 7.1 setup.
For instance, if your TV is in a corner, facing the rest of the room at an angle, then your sofa should be similarly placed with enough space either side of both the TV and the sofa for the satellite speakers.
Note that in no circumstances should furniture or architecture block the path of the sound from your speakers.