I am only an egg, but...:
I did the graphics layout on a sheet for the stencil-maker, which contained several versions of the art plus text for various steel types I regularly use.
My mark is long and skinny, mostly, so I scaled it such that it could be etched on the spine of a 3/16" thick knife, though I usually mark on the primary grind.
There's a version with and without 'USA' for space purposes. Smaller knives look cluttered with a whole billboard.
If your mark is square, like your avatar, you have fewer placement options, but that's hardly a show-stopper. I prefer a medium to small mark.
So far (been marking for a year now), I've been putting the mark on the left side and the steel type on the right, with a couple notable exceptions.
Hopefully some real pros will weight in.