Agreed on the outcome of a legit controlled environment vs umai bags.
Here's a pretty neat humidity and temp control combo I got: https://www.amazon.com/dp/B08935F5WY/ref=cm_sw_r_sm_apa_fabc_X45KVPDQJW9GFGNKB4F5?_encoding=UTF8&psc=1
It monitors the humidity/temps. with a bunch of features. But for the main part, you can set certain thresholds to have your humidifier kick on when the value reaches your set percentage keeping your environment consistent.
As far as the humidifier goes, I just used a room humidifier. Any will do, just make sure it fits your fridge.