The “Flipbac” adds a pull-down mirror to your camera’s LCD screen, making it possible to place the camera at odd angles but still see the screen. (Albeit upside down!) It can open in both landscape and portrait positions after it’s been attached using an adhesive, which is included.
It’s $25, shipped anywhere in the world.
Flipbac angle viewfinder product page [Flipbac.com]
Can it flip the other way? If not, I’d be tempted to mount it upside-down, for over-the-crowd shots. (“Up periscope!”)
Adhesive??!?! How about a screw mount? I suppose velcro would work…
It can flip open horizontally and vertically. I have used it for overhead shots, no problem. Yes, you have to get used to having the camera buttons upside down for those shots. But my overhead opportunities are a lot less than my waist-level shots.