1- Pre Planning
When you are preparing to start the installation, make sure you have about 1" on the left hand side of the rack between it and the wall or cabinet etc....... This will allow you to install the panels to each other. This will make more sense if you scroll down and see how they attach.
NOTE: If you have custom cuts panels, its best to lay out the top row of your rack and get an exact width. This will make sure you center it properly on the wall where it will be installed. Because of how they mount, we leave about an inch open when making the custom cuts.