Proper way is whatever allows you to comfortably shoulder and support the rifle causing the least strain/tension on your shoulder/neck muscles. Once you achieve this comfortable position, you then position the scope at the correct height and eye relief to match how YOU hold your rifle. Leaning in too far on your rifle engages way to many shoulder/neck muscles which in turn will cause significant fatigue and inconsistency. Consistent cheek weld and repeatability without hunting for a sight picture is key. Just slapping a scope on a rifle and lining up the eye piece with the receiver will not result in a comfortable and accurate shooting experience for most people.