I definitely thought about that when I placed them. They can only see one and it doesn't seem to phase them. Who knows if they work or not, it was worth a try in case it does.
My coop/run setup is very similar. My chickens free range all day though and I've seen racoon's climbing the gate on my night cam. So I added a 2 foot wide flimsy wire skirt at the top that falls in (my run is way to big to cover the whole thing,) and no more climbers. I thought I might have to...
My first run was as you've described, tall then short. It's been 20years of trial and error that has lead me to no "short" runs. What a pain in the rear. I "thought" I could just get my rake under the short parts or whatever, not sure what I was thinking because how much money does it save...