Its fine that your are instancing in the camera, in most cases for example, the player is instance into a scene and the player has the camera node.
You would need to be more specific with what those multiple things are that you want to follow the camera. But if its all GUI then it should work, as long as a node is child of the canvas layer it will follow the camera. Also the canvas layer doesn't have to be a child of the camera for it to work. Hope that helps!