Yes, I have had things come adrift in an aircraft and cause an unsafe situation. A towbar I failed to notice in the baggage compartment of a 172RG I rented bounced up while I was flying, and cracked the back window. I paid to replace the window, it was my fault.
I suggest that you not stick anything to the paint of an aircraft you do not own. Doing so might constitute a "major modification" for which an approval would be required. At the very least, if you damage the paint removing it later, you'll find out how expensive aircraft paintwork is! Paul Berterelli of AvWeb does know what he's doing, but, like so many things in aviation, the fact that an experienced pilot can tell you how to do something, does not mean you should attempt it! Leave the cameras at home, and focus on undistracted learning.