How do I place a game object on a tile.

Hello, everybody,

I try to place objects on single tiles with the mouse.
I can display the coordinates of the respective tile with a mouse click (e.g. left click = -8, 13).
I can click on the item in my inventory and it follows the mouse.
But I just can't get any further, how can I get the object to be placed on exactly this tile (Sprite changes and a suitable game object is created)?

If anyone could help me figure out how to connect the Gameobject with my value
"Vector3Int coordinate" that would help me a lot!

Many thanks in advance!