speaker stand height for "floor seating" usage..?

perhaps an odd question, but wanted to get some opinion for what would be a proper stand height for my home office setup, where all seating is on the floor... japanese 'tatami' style.

my loudspeakers are 14.5" in height, can anyone give me an idea what i should probably be looking at in terms of stand height for this application... a search of past discussion threads did not deliver any clues. thx in advance for any opinion or clarification, thx friends..!