In the olden days pieces like that would often come with flat piece of slate affixed to the bottom - a hole drilled thru the slate and a ss or brass screw spun into the wood.
So that would be one way to do it
I stopped once and picked up a hitchhiker. He said " thanks for stopping and not assuming I'm a serial killer or something"
I replied "Well, the odds of there being two serial killers on this road are very very slim"