You can import Premade Layouts by uploading JSON file in Divi Layouts folder. Here’s how to do: https://www.elegantthemes.com/documentation/divi/library-import/
To avoid possible conflicts, it’s not recommended to use two Page Builders on the same site. For example, DIVI and Elementor are not compatible with each other.
***Please read Troubleshooting & FAQ for Installation Guide, How to Update, Turning off License Activation Notices, etc.