Leave them be. Even though you can't see them the brake vents are still there, but I had to cut them back quite a bit on this new bumper for them not to push the bumper out. My car was designed to run them
After all, I'm not going to BS people and try to fly that my car is a real C36 when it's not. I honestly didn't even do this route for the AMG look. It was simply because it was far cheaper than going the OEM full replacement again. Won't lie though, the C36 *look* looks far more badass than my anemic-looking pre-facelift bumper.
Besides, I've looked up the price of the fogs and they're bloody expensive. Afterall, they only ran them on two models for a limited run.
*technically* if I could, I would run fogs there, but I'm squeemish to block airflow to the brakes through a system Mercedes designed to keep the brakes from overheating.
As a funny note, I debadged my model designation and got rid of all the residue from the stickers. Now people will have no idea what w202 I have lol! Perfect plan.