I believe the minimum listening distance for the 5a is 8 feet from the plane of the speakers (judging by the tilt chart in the 5a manual.) So it might be pretty tight fit in that room.
My preference would be for long wall placement (to put the speakers as far away from the side walls as possible). Because of the bass EQ, the Vandies do not need to be way out in the room, but that would still put your listening position close to the back wall. Some 4" thick panels on the back wall should help.
My preference would be for long wall placement (to put the speakers as far away from the side walls as possible). Because of the bass EQ, the Vandies do not need to be way out in the room, but that would still put your listening position close to the back wall. Some 4" thick panels on the back wall should help.