I am using 3 deg right thrust for everything because people who are interested in such stuff find that something about like that works pretty well for many set ups. The tangent of 3 deg is 0.05. So if you have an engine with the mounting holes 1" apart in the direction parallel to the shaft, offset the front holes 0.05" to the right of the rear holes.
If you have a phd in math I didn't mean explain the obvious. If you need to calculate how many deg right thrust is optimum for a given prop pitch, dia, rpm, plane geometry, and all else that factors in , I dunno.