You could just Auto-Orient towards the camera as they go behind.
But if you really want “thickness”.. just add this expression to the position value of your 3d object (2d) 🙂
position+[0,0,(index-1)*.5]
Then Duplicated around 30times, or whatever. Add a Pespective >Bevel Alpha to them all and Then Precomp, Collapse Transforms
“kis” it
Keep it Simple