I installed these cases on their laptop cameras for my friends and clients with no problem. Just look at the various light sources and sensors around the camera to determine its position. However, Apple has discouraged installing these types of covers on their new laptops because of the tight tolerances they can "break" the bezel around the camera when the cover is closed. Make up your own mind, but I haven't found any issues with any other laptop.
π TechPrivacy Webcam Privacy Cover (3 Pack) - Ultra Slim Slide for iPhone, iPad, Laptops, Macbook, Dell, Lenovo, HP & More - Protect your Privacy
10 Review
6 Pack Webcam Cover Black - NanoTech Reusable Adhesive Protection for Laptops, Smartphones, Tablets, Desktops - Works on Any Electronics Surface - Safeguard Your Privacy
11 Review
Aluminum Alloy Laptop Camera Cover (2 Pack)
10 Review
π· Slim Laptop Camera Cover, Ultimate Webcam Shield for Mac, iPhone, Surface - 3Pack
9 Review