I still do it the old fashioned way. Mark where the canopy will go, rough the covering with 150g sandpaper where the canopy flange will sit, do the same with the canopy flange, use a thin bead of RC-56 at the flange locations, tape in place until dry. You could install the small screws before glueing if you desire, but best to have the holes for the screws in place before you set the canopy. After all is said and done I use some colored electrical tape to trim out the flange.

Keep in mind that there's foam under the front of the canopy so if you use CA to harden the screw holes you don't want CA running into the foam. It melts pretty quick[X(]