Re: Speaker Splaying - the definitive guide...
As I have described it, you would need to kneel to get your head in line with the tweeter both in the horizontal and vertical planes.
You're welcome to raise the speaker up, however it then becomes a little harder to mark the spot where the coverage changes - you have to plumb down to the floor, or something.
When I did it last, I was about 6' from the speaker and that seemed to work fine for my purposes. This method has about the same accuracy as a hand grenade - it's just to get you a starting point for further refinement, so don't kill yourself.
For what the test does, I don't think floor interaction affects anything enough to matter - you're concerned primarily about the horizontal plane.
