Wow, yes! The centre of the bar is the lowest part of the back of the car so additional one really ought to locate above the original one I suppose. The droplinks can still work that way though.
On 2nd thought this won't work. You wouldn't be able to fit those red bits near the mounting bushes. Unless they were alloy or steel they wouldn't be firm enough and they won't slide on from the ends. They also need a better connection to the beam. In this scenario I think the two bars would rotate in relation to oneanother.
What about this-
Lay one bar on top of the other
Cut bits out of it where the shape won't let them fit together
Leave the mounting bush areas at single thickness
Weld them together and install as one!