Yeah, they do mount "upside down", but once you get used to it, it's no big deal. After you get in the habit of loading them "upside down", it doesn't seem right to load them the other way, ha.
After reading the Hansen vs Pittsburgh Pro HF trays, I'm going to immediately return or sell my Hansen trays. I can't believe the Hansen trays mount the sockets upside down?!
As I said in that thread, you can mount them rightside up. In fact, I think I've seen most of the pictures on GJ done that way. However, that sets them on top
of the little bulges which makes the socket (at least for all my impact sockets) almost cover the end of the peg and hide the number.