I usually use a PC3 lower, sometimes PC361 upper on the K&M stand, run an expression pedal on at least one, and at least one switch pedal on each board. I play seated, and don't have any problem with my legs (note that I frequently have the expression pedal just outside the left hand side of the stand. I'm 5' 11", and have the stand set so the lower board is about the same height as my acoustic grand's keyboard.
Howard Grand|Hamm SK1-73|Kurz PC2|PC2X|PC3|PC3X|PC361; QSC K10's HP DAW|Epi Les Paul & LP 5-str bass|iPad mini2 "Now faith is the substance of things hoped for, the evidence of things not seen." Jim