yeah get some bolts. How many bolts are you planning to use? cause a real trd wing requires you to have 9 holes for the install. 4 for the bolts, 4 plastic clips, and 1 for the brake light.
I don't honestly think you need all of 'em, but if you do drill all the holes, just use screws in place of the plastic clips.
When I installed my kaminari bumper, I just replaced the plastic clips with bolts and it's much stronger, I think