No, you are wrong.
You would only need it in one corner at right angles to the protrusion to eliminate rocking.
You would need one at all the other corners only to make it dead level, but we are not talking about it being level, just the potential for rocking.
Thinking about it more, no, it can't stick out. How about all the apps that have the built in spirit level thing.
Probably going to end up being flat, and this is simply a cheap mock up test.
It would mess too much up
^
Exactly. I would have thought that this was obvious - two protrusions at the top corners and the bottom edge make a VERY stable tripod; the most sturdy arrangement there is, even MORE than four protrusions