Most pinpoint servers land on their tossing hand side foot.
Pinpoint is a different animal. They seem to land on either foot, preferred by the player. McEnroe lands on his left foot, he lefty. Some players land on their other foot, it doesn't seem to matter because it's linked with how much twist you put into your serves. Some twist, some ab crunch, some pivot.
What IS important is a low trophy hand, a slight archer's bow, and a high hand, high elbow AFTER you contacted the ball, with your racket now pointing straight down at the ground.