Just like the title says. I have been seeing videos of people using differnt spots which would give much different results. I know this is not the be all end all for this setting but could someone tell me what is the proper place on the knee to do it from?

I have seen the front of the knee, the bone that sticks out on the side of the knee that is like at top of calf. And I have seen a little to the right of the knee cap there is like a dip.