Another vote for the ZL1 add ons rock guards. In person they really just kind of blend in with the tire/wheel well.. I don't even notice them when I look at my car. Worth it for their price point, and looks OEM. They are about the smallest you're going to get out of a product that will still protect the paint.
Look at some of the side shots of my walk around video - you can't even see them really
https://youtu.be/Sx5sYsqP9lM