I don't think that's going to work. Your feet need to go forward of your hands, so under it and you want to be about an arm's length from the screen. If you lean on the held of your hands, you don't want the laptop past the edge.
And: stand wearing comfortable shoes. Bend elbows at 90 degrees to the front. Let finger tips drop slightly below wrists. That minus thickness of keyboard.
The original Aldi £5 Lack on a desk design I found, had an adjustable shelf bracket attached to the front legs of the Lack but I didn't need it.
Also: as I just didn't get my own 'joke', Pi Lack = Pi rack. Obviously it doesn't "equal" it, as a Pi Rack is one particular Clustered-Pi configuration.