Hi!
Please take a look at the attached file. It works by setting the X and Y evenly to Count mode with only 1 row or column in each rectangle. I then use a macro to target the intersection between the Evenly rows/columns to place a sphere.
The null segment is required to "trick" RailClone into thinking there is something in the Y evenly input. Without this, it wouldn't generator those rows.

I hope that helps,
Paul