it's really odd, that for so many that I sold, they didn't jump in my holding tanks. But once they get to the customer's home, some would call me and said their fish jumped. I did not have a cover except a 2.5" and 3" euro brace. I am so lucky.
However, when I acclimate them some do like to sprint, so I cover the first bucket and put that in another bigger bucket filled with some water to make sure even in case they jump thru the first cover, they would survive for a while when I am back.