I can't lie, since pictures on this board show me with one hand high and in the center. This is wrong, I know.
But I think there's a danger to getting too strict with hand-position rules. Sometimes, for example, it makes good sense to let go of the wheel -- since it can correct for a spin faster and more accurately than the driver can. And shuffling versus locking at 9 and 3 should be dictated by the turns more than by any philosophy, in my opinion.
(But take what I say with a grain of salt, since I still haven't broken the habit of occasionally leaving one hand on the shifter and the other on the middle center of the wheel.)