Hi Angel @Angel90 ,
That would probably require a drastically different workflow, depending on how much you would break the dimension of the assets; if you have evrything 3×3 and a few 6×3 for instance, you might be able to adapt the process (not saying that that would be simple though).
Otherwise, you might need to Instance them on the Curves and then somehow add floors on top of that.
This Tutorial might give you some useful ideas: https://www.youtube.com/watch?v=XFbD3rqE1eM&list=PLVm7O9OzjT6EIDtFGC67QxGsHkz3_RbIw&index=26
