hey man, good choice on the skis! they are so much fun! i would say 5cm back from center. it's the factory recomended line and puts you over the fat part of the ski (meaning thickness, not width). you don't need to center mount them, it's not a park ski. plus it's the point that lets the sidecut work for you. when i first got mine i mounted them 3.5 back and felt forward of the sidecut - they still are amazing no matter what. but i am moving mine back to 5 back from center because i think that is the best spot to allow you to get the most out of the ski. then just pray for pow so you can take them out and shred!