Hi and welcome to BP.net!
In the research I have done, I have read a humidity hide should be placed in between the warm and cool side. I placed a humidity hide in for mine, but she did not have any interest in it. So I switched things up as she is in shed and it has been working perfectly. I build up around 2" of moss over half of the tank, covering her warm side completely, then cover that with aspen. The moss holds the moisture extremely well, keeping the humidity up without over spraying or blocking off the ventilation.
I replied to the post here temps in tanks and explain what I do in a bit more detail if you are interested. Or send me a message and Ill send you any info/data I have.
And a big thumbs up for being 100% ready for your new addition!!! I cant wait to see some pictures when you get him/her! Congrats! Cheers!