Can you make a cliff with players falling off if venturing too far?

I’m using the levels module for a dock which is half on the top of a cliff and the bottom just above sea level.

However I’d like the players to start out of the building, 13ft height on top of a cliff (just before the main entrance to the dock), instead of starting on the ground level. Is this even possible?

And if so, could I automate that if they go over the “cliff” they fall on the sea level?

Thank you and sorry if this is a dumb question!