Move UI element to world gameobject position

UI2World.cs

// https://forum.unity.com/threads/overlay-canvas-and-world-space-coordinates.291108/#post-9627593
// translating between overlay canvas and world space coordinates
uiObject.transform.position = RectTransformUtility.WorldToScreenPoint(Camera.main, worldObject.transform.TransformPoint(Vector3.zero));

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// http://answers.unity3d.com/questions/799616/unity-46-beta-19-how-to-convert-from-world-space-t.html

 //this is your object that you want to have the UI element hovering over
 GameObject WorldObject;
 
 //this is the ui element
 RectTransform UI_Element;
 
 //first you need the RectTransform component of your canvas
 RectTransform CanvasRect=Canvas.GetComponent<RectTransform>();
 
 //then you calculate the position of the UI element
 //0,0 for the canvas is at the center of the screen, whereas WorldToViewPortPoint treats the lower left corner as 0,0. Because of this, you need to subtract the height / width of the canvas * 0.5 to get the correct position.
 
 Vector2 ViewportPosition=Cam.WorldToViewportPoint(WorldObject.transform.position);
 Vector2 WorldObject_ScreenPosition=new Vector2(
 ((ViewportPosition.x*CanvasRect.sizeDelta.x)-(CanvasRect.sizeDelta.x*0.5f)),
 ((ViewportPosition.y*CanvasRect.sizeDelta.y)-(CanvasRect.sizeDelta.y*0.5f)));
 
 //now you can set the position of the ui element
 UI_Element.anchoredPosition=WorldObject_ScreenPosition;
 
 

This really helped me. Really good solution. Thank you.