Stereo5, Not ’mounted’ for sure I agree, but placed immediately in front of the wall for sure (for folks interested they can look at the pictures of your system which you have posted).
Other than the back injury you would have probably incurred had you mounted them on the wall, I’m not sure that there would be much sonic difference, on the floor or on the wall. :-) I pulled mine 66 inches out into the room and they are part of an (almost) equilateral triangle with my listening chair at the apex of the triangle (where else).