I anchor with my index finger on the point of my cheek bone and my thumb knuckle on my ear lobe. A higher anchor helps me keep my elbow down.
I don't think it matters where you anchor as long as it is consistent. If you are thinking about your anchor and your grip your shooting will suffer. Your only focus should be on the spot you want to hit everything else should be second nature. Find a comfortable anchor and stick with it. If your shooting high or low your mind will correct it. Just my opinion but I'm told I'm wrong a lot.