However, there are plenty of GNDNs found in engineering, the sickbay med lab, auxiliary control room, etc. Your statement that they aren't found inside rooms seems incorrect.
Belay my comment, it was
incorrect. For some reason I had the huge corridor panels of mind, but of course there are plenty of the smaller ones and feek61
did an excellent job at tosgraphics.com of compiling these. If I'm not mistaken he compiled these for the corridors but I wouldn't be surprised if he'd eventually do a compilation which parts of the rooms these showed up, too.