Run screws anywhere you can.
Cover with silicone caulk.
A secret few know of silicone caulk(or whatever you're using) is that latex paint can be mixed with it to match any color. Doing this will hide screws and the flare/body joint.
Just do a squirt of caulk on some cardboard and add drops of paint until it matches.
Or
My zr2 has large head rivets holding the flares on.
They are now a decorative nuance that you couldn't pull loose without just short of a winch.
The rivets come in many colors.
https://www.amazon.com/your-orders/p...ntId=DfrFtT2Xx