Ok guys, jest aside. I am right handed, and have my larger engines at 12 O'clock so I flip the prop downward. It is a flick from the wrist and elbow, so my hand clears the prop disk very quickly. All glow engines I bump flip to start.
My brother in law is a lefthander, and uses the under flip. I did see movies of lefthanders stradling the plane and flip from behind the prop working disk. That way you can hold the plane without tethering it, and always stay behind the prop spinning disk. That's a very safe way to go about it.
I tried it, but my left hand coordination is a bit lacking, whilst at 68 years of age I am not all that willing to put a lot of effort in changing habits.