The one on the top would work best due to it' low profile.
6 x 11 is more then enough
Like those but in plastic so you can easily cut a hole for your BP, the problem with terra cotta is that it will chip off and it could injure your BP.
Thank you. You don't he'll feel less secure in those hides because they're so light and will move around as he enters and leaves? I had a smaller plastic dish type hide for him it seemed to almost freak him out that it'd move around when he pushed by or into it.