I'd stick with the Vokal centre and go for the Dali on walls - they are sort of 'wedge' shaped, key hole mountable, and you can mount them on the wall in either portrait, or landscape, with the speakers towing in slightly - http://www.dali-uk.co.uk/en-GB/Loudspeakers/IKON-On-Wall-MK2.aspx
Hope this helps!