Pro-Tip: Your placement of knobs on both base and wall cabinets may differ slightly based on whether your cabinet is constructed with the cope and stick method (Shaker style) or the mitered method (traditional recessed door). Cope and stick cabinets have stiles and rails that meet at 90-degree angle while mitered stiles and rails meet at a 45-degree angle, creating a diagonal seam all the way to the edge of the corner. Learn more about the differences in our cabinet door style guide.
On your cope and stick cabinets, the 2 ½ to 3-inch rule works well because you can unusually still install the knob on a single stile. (Unless you have skinny Shaker cabinets, which will likely require that the knob be installed on the recessed panel instead.)
With mitered cabinets, you will need to be careful not to drill a hole on the diagonal seam of your cabinets, which could cause them to splinter or separate.