That can't be hooked up. The top unit would have to have the bottom removed so air could blow through it. Then the compressor would fall out.
Maybe it's like when I was a kid when our big console tv crapped out we just set the new tv on top of it.
Just read the third page of threads I still don't know how it works. Get more pics.
look closer the base pan is not on the top one, so basically it seems to just be the coil and shell, with the condenser fan and top removed from the bottom one, and compressor removed from the top one.