Corner placement, if you have room for it, has worked well for me in the past. It seems to diffuse room nodes quite effectively, making for smoother response across the spectrum. In my case, I had Meadowlark Shearwaters placed unequally, that is, one speaker was further along one wall than the other. In acoustics, asymmetry is king.
You would do well to consider acoustic treatment for the enclosed corner, though, in my opinion. A bass trap, or a bag of fiberglass insulation, or an absorber panel on one of the two walls, will help imaging a lot. Also, try to keep your equipment out of the enclosed corner.