First question is if you're going to just drill the holes you need, or if you're going with complete (32mm) hole lines / pattern.
Second question is what slides are you going to use and how/where you are going to fix them to your drawers. (They will determine the spacing of first hole of the line, starting from bottom.)
Third question is if you want recessed/flush drawer fronts. (This will, in conjunction with the slides and their hole spacing, determine spacing of the first hole (line) from the edge.
For the original SYS-AZ drawers the PDF neilc linked will give you all of this information.
If you like me build the drawers yourself - you need to calculate and measure yourself and use the information provided by the manufacturer of the slides.
In my case I went with Hettich 5332 ( https://web2.hettich.com/hbh/addon/de/TA_2016_01/bk_1609.pdf
) and I wanted flush drawer fronts, so I used their information to plan/calculate and drill my complete 32mm hole lines /pattern.