Microsoft Windows Installer in its guidelines doesn't advise adding a shortcut to the uninstaller.
Go to the Files and Folders page by selecting it in the left-side panel. Select the “Application Shortcut Folder” in the left side tree by clicking on it.
Click the triangle next to the Shortcut Properties Dialog.toolbar button and choose “Uninstall...” or click the “New Shortcut To > Uninstall...” list context menu item. Click in the
The Uninstall shortcut will be created in the “Application Shortcut Folder”. You can move it to a different folder by drag and drop.
You can customize the newly created shortcut from its “Properties...” context menu item.
The Uninstall shortcut is actually a shortcut to the external msiexec.exe file in the Windows System folder and giving the current Product Code as argument.