well, the idea of turning tube mics upside down is to prevent that the warm air is rising up and flowing along the diaphragm, which might or might not damage (warp) the diaphragm.
I turn my LDCs upside down and put them on a high boom stand behind the music stand so they are not in the way (both visually when the singer reads sheet music; it also avoids that the singer bumps into the mic stand).