The guide states to center mounting bracket vertically but the printed instructions show horizontal mounting. Is there a video?

Hi Dian, the template guide on the back of the packaging shows to position the mounting brackets horizontally in relation to the horizontal 6-in line that is shown spanning from the center of each bracket. Ideal distance apart for bracket placement is 6-in from the center of the left bracket to the center of the right one. Cut out the bracket placement template on the back of the packaging box and use it as a guide for leveling and for marking your screw holes. Hope this helps.