Doc. Every street tire I have seen that has a V tread style is mounted with the sharp end of the V pointed forward on the top of the tire >>>>>>>>>>>>> forward.
My Z3's had both Goodyear GS-D2's and Toyo T1S's, both V-tread designs and on both sets the narrow end of the V-tread hits pavement first when going forward. Or another way to look at it, if you look at the front of the tire, you'll see the V pointing down like in this photo: