I've actually done that a few times. One under the mat, the other in my hand. But I have something else in planning/implementation, which is similar to what you described.
You can find the videos under "Candid Floor". (Not in school.)
CandidJohn
2023-04-02 11:22:58 +0000 UTC
hey, i never did such video myself. but did you ever try or think about it to make a hole in the doormat and put your phone below the mat? if it would work it would make your life easier. and maybe put another hidden cam to film from other pov.
the reason why i thought about it. its because either in this or the previous video your jacket got moved and view got covered by the jacket,