Saving model position on World Mapping? (ARKit)

So, I place a model on a plane… I then save the World Map, and the position of model. When I restart the app, Load the World Map, and place the model based on the saved transform position. The model’s position isn’t consistent on the plane. So I how do should I place the model consistently on the spot I placed it?

I think I solved it by placing an anchor on the plane and the model’s position to that anchor.

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