Interface
Viewing the grid co-ordinates within a Snapbound Tiles is the same as that of a TileMap. To do so, select the Node in the Scene Tree Dock, mouse over to the a grid and the co-ordinate should appear at the bottom-left corner of the viewport.
To view the grid position of a Playing Piece, simply mouse over the Node in the Scene Tree. If the Playing Piece is a child of a Snapbound Tiles or TileMap, the co-ordinate should appear.