I like to put mine up a little higher. About head high. The deer seem to pass off the flash as lightning rather then have it go off in their face. Also, if your trailcamera doesn't have a viewing screen, you may want to take a camera with you that uses those cards. That way you can look at the pics and make a decision right then and there if you want to leave it in that spot or move it.
Don't visit it too often as you will be leaving your scent there every time. No sense in letting the deer pattern you. I don't use corn, i just put them on the trails so i leave mine out for a month at a time.
Try to be as scent free as possible when you do visit your camsites.