dedicated theatre room side surrounds ht. between 6-7' as I've read here b4 riser about 10" high seats only a ft. away from back wall due to short room if I put the rears at the same ht. that only puts them about a foot above viewers heads is this OK? I can go up about another ft. would this be better? back speakers will be recessed into columns, as sides are speakers are M & K SS-150's Thanks for your help!!