it is not any less consistant if you have a special spot you anchor, most people that "anchor on the side of their face" have a spot on the side of there face they hit,
i believe rich welch uses his thumb on his ear lobe, howard hill had a tooth he could feel, i have even heard of someone usuing a mole on their face.
you can shoot with your foot if you do it consistantly. just find a good solid anchor and a double anchor is best.