My balls I feed inside the enclosure, one of my balls eats frozen, I usually thaw out just in time for his/her florescent light to shut off. I place the rat on top of the hide, it is usually gone within 20 mins or so. My other ball is still on live, I feed him inside the enclosure as well. But since this one is on live prey I remove the hides first. I do this just because I'm worried that if I leave the hides in, the rat goes inside the hide with the snake and I can't see what is happening.
My recent addition, my Boa, I have only fed once, (f/t) just placed it inside and about 25 mins later it was gone. I have all my snakes on eco earth.