I got my daughter to stand directly behind me then about 20 or so… (probly more) feet back. Then I adjusted my mirrors to where I caught half her body on the inside edge of the mirror on each side. This allows to see what is behind me and catches what is about to go along side of me. As far as to the side goes…. theres always going to be a blind spot…thats why HEAD CHECKS are imperative to be in the habit of.