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This. However, I keep my sunglasses in a sunglasses case in one of the cup holders in the center console (not the cup holders under the armrests, the ones under the sliding door).
For short intervals flip my sunglasses upside down and shove the open arms into the slot below the center console. I holds the glasses tight and they are at the ready. I keep a cleaning cloth in the little pocket to remove the smudges I get on them when grabbing them.
For longer intervals I just keep them in a glass case in the map pocket.
Some put them in the door pull area below the side window. There is a storage bin under the front of the center consul. Some put them vertically in the triangle area to the sides of the removable cup holders, or sideways where the extra cup holders are under the arm rests. Lots of places.
Not an X owner, but a new S owner. I was wondering the same thing when we got ours, but I just naturally put them in that exact spot in my center console. They've stayed there ever since (well, except when I need them on).
Plus, I already filled up the Norm cubby with other stuff.
I have a cubby drawer from RPM Tesla, I think it was around $40. Whether from them or someone else, it's one of the best and most used additions to my X. Previously, sunglasses went flying. Now I have those and some other small items in the cubby.