I tried both turning on the camera in normal position, orientate it and start recording, then turning it on upside down already but....It only works with QuickTime for me!
With VLC I see the videos upside down, the same ones with QuikTime are oriented properly.
Tips: I still didn't use any professional video editing software so I don't know how they'll be imported there.
With "Movie Maker" (freeware) the imported videos are still upside down, BUT it's easy to rotate them as you like and then you can export and see them correctly oriented with any other player (so I guess more professional softwares have the same possibility). This means you can attach the cube as you like!"