With that limitation on setup, you would probably get better results with speakers that have very wide dispersion pattern.
A pair of small Ohm Microwalsh which are largely omnidirectional would fit and might be worth a try.
http://www.audioreview.com/product/speakers/floorstanding-speakers/ohm/microwalsh-talls.html
A pair of small Ohm Microwalsh which are largely omnidirectional would fit and might be worth a try.
http://www.audioreview.com/product/speakers/floorstanding-speakers/ohm/microwalsh-talls.html