Even if your temple points have receded back you can still do a topper. You will need to make a template so that it matches the temple points. Obviously you can't do a Brad Pitt hairline but you can certainly have a receded hairline that blends into your hair at the temple points. With this style nobody will suspect you are wearing. But like JRob said and I believe is one of the dead giveaways is having too much of a straight hairline and having the wide forehead look. Again, it depends on what look you are after. I believe that Fred shows a good example of going with less density, a little more recession and a nice job blending it into his temple points. Like I said, make a template and where your hair stops, draw a natural looking hairline.