It does work in a 1200. I'm using one right now.
As for passthrough, the Amiga video out should connect to the side closest to the 100pin Zorro connector. Picasso video out is the far VGA connector.
It's an external solution, so It'll work on any Amiga with Zorro slots. Internal passthrough graphics cards (PIV/CV3Dscandoubler) will not work on 1200s without the now-impossible-to-find video slot enablers.
