all those will work but literally as of now my ball will climb up and down it and cant get it open, when you close it it has to come up and then over a lip and then you press it down and it does almost lock you feel it grab into a snug position. i actually check all the doors on them before i bought this one and this was the one that gave me the most secure seat in the door. but you could easily wedge something (block) or what have you in between top door and tub and if they get out of that well then there is no hope