I've found string mounted clickers are hard to use with a high anchor. They're also harder to shoot well out of awkward angles. Both points in favor of an alternative clicker system... The most effective way to rotationally draw a bow is probably going to end with your string hand around your jaw bone. As you raise it to anchor, you will have a hard time avoiding a slight loss in draw length. Personally I find I am usually half an inch longer at that moment in the draw than at my final anchor point. I'm sure there are some form corrections available, but I shoot too well to change what I do right now.
But if you train yourself to draw directly to anchor point with your back muscles a limb mounted clicker is great.