Wrong forum / this is a UI question and thread belongs to UGUI forum…
Some options to place UI object relative to 3D objects:
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Create screen space canvas that has elements, which follow world space positions converted to screen space positions. See this thread: Create UI health markers like in World of Tanks
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Or create a world space canvas, scale it and place it over your object.
Position animation is trivial to add, once you get the location/placement of element working.