I seem to be one of the few that have actually seen a B. Dubia take to the air.
The males will want to take off in the spring and find another colony
of females make sweet love too.
They cannot gain altitude on their own very well
and struggle with keeping level flight. (typical guy huh?

)
All that you really need is to have container walls a few inches higher
than any launch point. They'll never clear the tower that way.
Nor will they be able to climb up and out of their prison.
and even if they do happen to fly
they'll be all alone out there until they die a few days later.
The females are wingless and will remain in the container.
all in all a great feeder... and they don't move too quickly for the cham to target.
I use the nymphs and females due to the greater meat to shell ratio.
the males are best picked out when they're shedding and fed quickly.
otherwise they're just all shell and wings.
I also keep hissers and discoid the hissers are good fun to feed
after a molting when they're soft and go down easy with a nice gooey center.