Replying to Binding mounting question for my father.

My father recently purchased last years seths in a 179 and some look px 12 lifter bindings. He is 63years old, 5' 8" and about 140 pounds. He is going to be using these skis as his only pair of skis. He skis vail the majority of the season, sometimes beaver creek, but all of the mountain,  groomers, crud, and powder whatever. He is a very solid skier, and for 63 he charges. He does not know where he wants his skis to be mounted, obviously switch skiing is not a concern of his although he mentioned not wanting a lot of ski in front of him leaving him with short tails. He asked me "what do I tell craig", his tech/tuner guy, "in exact words where I want my bindings mounted there are too damn many choices on the side here." Any input would be very helpful. Thank you in advance.