double side sticky tape ? for stick it...lol...joking.
Front grille need to be hold at the top and bottom by screws (our stock grille)
now, the bottom of FD2R front grille have clip to mount ONLY fit to FD2R bumper, not for FD bumper (that's why we have to trim/cut them off)
because of that, the grille don't have clip to mount the screw at the bottom.
That's why we need strong double sided tape to hold bottom part to our FD bumper (top part, we just screw to stock mount position)

thr trim of edges, if you don't want to cut off, it's ok too.