If the truth be known, most speakers are tricky to place. If you simply set them up and leave them, you could be missing something. As with most things in audio, especially speakers, it requires some tuning. Set the speakers up, listen and note what you like, and move them slighly and listen again. I have rarley seen an incident where someon gets it right the first time. In fact, several dealers I frequent have noted on the floor where certain speakers sound best. These notations are made after many hours of experimentation. Of course, you home is not only for stereo equipment (it hurts to say that!!!) but for living. This needs to temper your placement.
Incidently, Axiom once offered their top of the line model AX5 with a rear firing subwoofer.....THAT was a tricky placement in most cases!!