Anemonefish are at high risk when they don't have an anemone or a suitable surrogate host/home like a coral or ceramic flowerpot.
Without such they often like to hang out in corners near the waterline, which makes them high risk.
On the other hand, with the right anemone the likelihood of clowns to jump is near zero as they will rather dive into the anemone than flee upward.
Before my first percula pair got their gigantea the male was always hanging out in a rather dangerous spot, and every morning I checked if he was still there.
Now, that they have a gig, they hardly ever lose contact with it. At many times you just see their faces peeking out. If they ever venture out, the most distance they go is about one body length.
My other two pairs with giganteas behave the same.
The one pair that is so far without anemone wanders restless through the tank and sleeps at night under a half dead birdsnest coral.