What kind of a room is THAT?!*

If that is a half wall opening, sitting there would be better as Trevor said. You could also place your couch symmetrically
between the speakers.

Regardless of which way you go, you may want to place sliders under the speakers. That will make it much easier to move them around so you can eliminate position error. The 660s will be more forgiving of position error than the 60s.

No matter which way you go, I think it will sound very good.

*Just kidding.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated