How to make a 3D floor for shadows?

In my enviroment there are some objects around my model, and I would like to make it look like at the render that the shadows from my model are on them.
So something like the built in floor, but it's just a 2D object and i need more special shape for that.
Is there any special material or option to make transparent objects that don't have own shadows just shadows on them from other objects?

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