No any extra wall plugs required for the installation. Your installer needs to drill holes in a wall and push the letters with metal screws inside the holes, that’s it. Metal screws are going inside the holes without any extra plugs. See the attached image please.
![house address installation](https://lawnbagsigns.com/faq-blog/wordpress/wp-content/uploads/2019/11/Letter-Installation-1024x832.jpg)