Doubt about placing items on tables

[Rbrons]

Hello everyone.
I have a question about how to place items on a table exactly in the center of it in a fixed way, which the player can pick up or place whenever he wants. An example is as seen in the game “Overcooked”… seems like its works like a grid.

What should I do? I already have the item with rigidbody, and the table also, both with colliders. The player already collects the item as well.

Another example I made…

Thank you all!!

[itsharshdeep]

Following is the script I have made in the hurry up. You can check this. I tried to set random scale and positions and it worked. But there might be the special cases which need to consider as per the requirements

using UnityEngine;
using System.Collections;

public class TableChild : MonoBehaviour
{
	MeshRenderer meshRenderer;

	void Start ()
	{
		meshRenderer = gameObject.transform.GetComponent<MeshRenderer> ();
	}
	
	void OnCollisionEnter (Collision col)
	{
		MakeChild (col.gameObject);
	}

	private void MakeChild (GameObject go)
	{
		//getting externs bond
		Vector3 goBonds = go.GetComponent<MeshRenderer> ().bounds.extents;

		//Setting the positon of the object
		go.transform.position = new Vector3 (gameObject.transform.position.x,
			meshRenderer.bounds.extents.y + goBonds.y + gameObject.transform.position.y,
			0);
		// After setting the position then making the child
		go.transform.SetParent (gameObject.transform);
		
		go.GetComponent<Rigidbody> ().isKinematic = true;
	}

}