I've read in past posts that good results can be had using an M2 as a vertically-aligned center channel. Could it be used horizontally as well, understanding that dispersion might be a little uneven?

My girlfriend disapproves of the vp150 on account of size, and I've read lesss-than enthusiastic endorsement of the vp100. An M2 would be perfect, accept that my better half complains a speaker standing up would block a picture we have behind the TV.

I'm not too worried about unevenness in the horizontal dispersion, as the left side of our living room sitting area is near a wall and no one sits there for tv? Which is the better choice, the M2 horizontal or VP100? Thanks.