Positioning Bevs is interesting. The classical positioning, at least for the older ones that had 180 degree dispersion (up to the Model 3), is to put them facing each other on the long wall, about a third of the room length from the back wall. You pick up reflections from the back wall in addition to the direct sound and the other room reflections. Supposedly this orientation gives a huge soundstage, at the cost of some detail and image specificity, which makes sense to me. The more traditional loudspeaker orientation relies more on sidewall reflections (since there really is little to bounce off the back wall). This orientation gives a more precise image, but a smaller soundstage (which is still pretty large). The good news is that they are not that sensitive to distance from the wall, since they were designed to be put directly on it. Where the side walls are, and how they are damped, does matter.
I cannot try the classical Bev position in the room I have now -- the room is really odd. So I use the more traditional loudspeaker positioning.
As to which is more "correct," my opinion is that the traditional loudspeaker positioning probably is. However, my understanding is that the classical Bev positioning is very seductive, and if you listen, for example, to opera, it may well be worth it. For solo acoustic guitar, it probably is less realistic. I think it depends on what you listen to, and what sort of room you have.