Disclaimer: None of us here at Atomik train on monos nor will we ever due to the high risk of injury though we appreciate that some do need to train on them. Copied with permission from Tony Yaniro.
Mono #1 : 3 pads deep and heavily incut. Due to how steep the 45 degree angle of the mono is, we recommend only using on steep walls. On a 45 degree wall it will feel almost neutral.
Mono #2 : 2 pads deep and incut.
Mono #3 : 1.5 pads deep and slightly incut.