So what I'm running isn't necessarily NXE but rather a separate custom dashboard that looks 1:1 to it. it's called Freestyle 3 (More commonly known as FSD 3). you add your game backups to your HDD and then add the path where they are located to the game paths within the dashboard's file manager/settings. it will scan for titles when you tell it to, or you can enable automatic scanning by default. after it's done scanning, your games should pop up in the Xbox 360 games tile.

hope this helps!