There seems to be lots of cost and regulations depending on location.
This is the best article I could find.

In the US we would need to register as a Money Service Business with FinCen and adhere to different state laws. https://coinatmradar.com/blog/revenue-and-costs-of-running-a-bitcoin-atm/

We would need to set up Anti-Money Laundering compliance program.https://www.acfcs.org/news/330368/A-Beginners-Guide-to-Operating-Your-Own-Bitcoin-ATM-and-complying-on-AML.htm

We would need to start with the legal basis first, and determine where we plan to set up the ATMs to know which laws we need to adhere to.