Hi Mike, mine are toed-in less, around 20 degrees. But I sit quite far, around 4.80m away, so the intersecting just behind head sounds about right in many cases. The speakers sit 2.35m apart (measured from center of drivers), 0.95m from side walls and 1.95m from rear wall (to back of speakers). I focus first in getting the best tonal density and mid bass definition, the soundstaging part then fall into place nicely with them totally disappearing.
Re the perpendicular 'location' as mentioned in the manual, my understanding is that it's meant to suggest best for both speakers to sit at equal distances (perpendicular line) to back wall rather than the perpendicularity (toe-in) of the speaker's cabinet 'position' itself.