We've been discussing adding the option to flip a panel for while. It could/should be implemented in some in the future. In the meantime, if the module is not already available as upside-down you can add it yourself, but make sure to tag it as Unlisted. It's a bit of a pain to get duplicate modules just because someone wanted the panel flipped (my personal opinion anyhow). I have a few that I've uploaded myself (it's a fair request) but I tag them as Unlisted to avoid duplicates for others. :)