Where to solder hole on tub to best retain humidity?

Alright question! For my BRB higher humidity is obviously needed and I’m moving her to a new tub. Is there any benefit in soldering holes either more towards the top of the tub or towards the bottom that would help keep humidity in? Or does it make no difference?

I don't think it makes a difference in a tub. If you are using coco substrate you can keep the humidity as high as you need it with zero problems. That has been my experience anyways...

I don't think you even need to put holes in tubs unless you want to lower your humidity. I don't have any in mine. There should be enough of a gap between the top of the tub and rack shelf to facilitate proper air flow.