I absolutely adore these shelves! They go very nicely in my mini bar and feel sturdy. The shelves do not mount, but are kept in place by tension. That's why it's very important to use the template. Rather than mount/adhere the template to the wall, I laid it flat on the floor and took all the measurements between the holes. 

Note: The color of the actual shelves is actually gray, and not white like the product photo portrays.