While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
Keep in mind that the mounts fit either way (180°) and depending upon your scope, and eye relief, how you mount it may allow more or less forward/rear ward flexibility for optimizing barrel clearance.