The long wall should do well. I personally think having adequate distance from the wall is more critical that the listening distance. I think the reason they recommend 10+ feet is because the tweeter is so high and you've got to be that far out to be in it's sweet spot. I work around that by turning the rear spikes all the way down and turning out the fronts just enough to get through the carpet. I've got mine pulled out 23 inches and toes to see a shallow angle of the insides. I STRONGLY recommend a diffraction or absorbing solution for the wall they're facing, possibly both, with little or nothing behind them. That seems to yield the deepest, widest imaging.
I love these speakers. I think with proper placement, room treatment, and electronics these things are extremely hard to beat for the money.