So can 7 mode be activated inside the plugin or would that require another plugin?
Viewing post in [ANSWERED] Is this compatible with MZ3D by Cutievirus?
7 mode is like a 3D plugin like MZ3D, so you'd need to get 7 mode plugin if you want your project to become 3D.
https://forums.rpgmakerweb.com/index.php?threads/ultra-mode-7-rmmv-rmmz.94100/