I'm wondering if the type of monitor makes a difference. If its specifically a near field, it seems it would make less difference, but I really don't know.
Seems the far fields have pretty precise designs in the tweeters. Sort of like a PA, because they have to spread high frequency detail evenly throughout a much bigger space.
I would be surprised if you could turn a far-field on its side and it gave you the same result, but I've never tried it, and never known anyone to try it lol. Again my point being a mere hypothesis that the results would be less noticeable at close range, with a monitor that was designed to work at a close range.
When I was talking to room designers (for my own spot) about the Augpurgers and other midfields, both Russ Berger and Wes Lachot made a pretty big deal over how important it was to have them properly tuned to the room, and putting them in a highly flawed room nearly defeated the purpose of having them. The necessity of them (especially for the $40,000 it costs to acquire them) seems to be a subject of debate. But they didn't seem to follow some of the same placement and installation principles as a normal monitor.