Security in tubs and RACKS!!

[danielwilu2525]

So to further my collection, I want to buy a rack. Cserpents lives close to me and has some great reviews, so that's a plus. Now, I'm Interested in getting their sub adult rack (basically 28qt sized tubs). They also sell dividers for this specific rack so this is my question, can I fit in 2 hatchling ball pythons In one tub IF they have the divider? My 300 gram boy I'm pretty sure is going to be just fine, but what about future hatchlings?

2nd question
My Sammy Is in a 15qt tub, however it isn't in a rack. I have heard that this can stress him out a bit, so you guys got any tips? I heard putting a towel over the tub is good as well.
EDIT: Humidity question in racks.
When I watch youtube videos of breeders and such with they're racks right, I see that they don't have any holes. Does this mean humidity is perfect? Or do you still have to pluck holes Into the tubs?

Thanks! Daniel.