ToolRendererHelper.cs

using UnityEngine;

[RequireComponent(typeof(SpriteRenderer))]
public class ToolRendererHelper : MonoBehaviour
{
    [SerializeField]
    private bool _useSortOrder = false;

    private int _defaultSortOrder;
    private Vector3 _defaultLocalPosition;
    private SpriteRenderer _renderer = null;

    private void Awake()
    {
        _renderer = GetComponent<SpriteRenderer>();
    }

    private void Start()
    {
        _defaultSortOrder = _renderer.sortingOrder;
        _defaultLocalPosition = transform.localPosition;
    }

    public void OnRenderToolFront()
    {
        if(_useSortOrder)
        {
            _renderer.sortingOrder = -1;
        }
        else
        {
            Vector3 pos = transform.localPosition;
            transform.localPosition = new Vector3(pos.x, pos.y - 0.0007f,pos.z);
        }
    }

    public void OnRenderToolBehind()
    {
        if(_useSortOrder)
        {
            _renderer.sortingOrder = _defaultSortOrder;
        }
        else
        {
            transform.position = _defaultLocalPosition;
        }
    }
}