Tips:
1) Speaker spacing should be the distance of 1/2 the tv width. So if your tv is 40in. in width. Each speaker should be 20in. spaced from tv to far side of speaker.
(This recommendation kind of differs when you get into larger displays or screens).
2) Rear speakers could be placed on floor firing up. Since they are for rear fill.
(I did that once for my 5.1 in a small space once and it really worked).
3) Some poeple place their sub between tv and speaker.
(Not me, but some people do).