if you toe in the speakers so that they crossfire in front of you, you can get as close as 4ft.
Ah Yes the old "headspeaker" (as opposed to headphones) set up.
I have used this many times and find it excellent.
Since the woofers create air movement in larger waves that travel both "up" and "down" the cabinet (or any boundary) the integration is no problem.
And you would sit at the same height for the tweeter and neopanel as normal.
If the speakers are well out into the room (6-8 feet) or the front wall is really well treated, the depth and soundstage with this set up is quite remarkable.