We believe you should start by understanding the costs associated with this like Buying and installing ATM Machine or Licences & Permits.
You should look for places with high footfall and a need for cash. For example, Convenience stores, liquor stores, and bars are among the popular spots for ATMs.
You can ask the processing company to install the ATM or do it yourself. Remember, you want to get it installed without a glitch, so it is always better to get it done by professionals.