We use those, too, if the ones at the Cancun airport weren't working or we were in a hurry, or to top off our cash reserves during the week. Scotia Bank and HSBC are trustworthy.We use the Scotia Bank ATM inside the Chedraui. They have 3 ATMs of different financial institutions side by side. Feel those are the safest and most likely not tampered with.
To the OP: I would guess any ATM inside a Chedraui or other big store is a safe bet. I suggest avoiding those standalone ATMs on the street and at the back of mom and pop stores that look like they could more easily be tampered with. I wouldn't use those kinds of ATMs anywhere, including the US.