Taping inside the edge and using a thin line of glue right at the perimeter will give you the best result, but I personally don't have the patience to do it that way. It would really benefit me with my full cap mohawks to have a glued edge since the french lace coupled with the tape makes the back edges prone to lifting.

Maybe I need to suck it up and start practicing a technique to glue the edge. The extra couple of days I can get form the attachment would make up for the extra attachment time....