The atm has no cameras, I would take precautions against such etc. Plan to print on qr code and use that. Not buying crazy amount will probably be below 500 USD, and I am sure no id on the machine regardless of amount.
mycelium would be on a used android phone I bought of ebay that is not my normal phone. I could download onto my phone with home network or public wifi.
The address would be used for this and that is it.
Are you sure it has no cameras? Just because you don't see one blatantly on the machine doesn't mean you're not on camera. It could be hidden subtly somewhere or not even on the machine such as 100' away in clear LOS with a nice optical zoom.
I would bet a lot of coin on that fact that you're be recorded in some way or form at any BTC ATM. And that means you're going to leave a trail in a public blockchain that goes directly from you to a market.