It would make sense to avoid module duplicates just for the sake of seeing one's module in its actual orientation.-

On a side note, I am toying with the idea of having a 1U-ish row of 'rotated-by-90-degrees' modules. To manage that in the Module Browser/Planner, a Rotate [r] command would be great. Using it twice would also solve the flip/upside down problem. But that's probably too far off of everyone else's needs.