The only reason to get an adjustable panhard bar for small lifts, is if you have problems with the drive shaft or other component hitting other stuff underneath when you are fully articulated one way or the other.
If you do the math the amount the axle shifts over from 2-3 inches of lift is like .01 inches. It's minuscule. It's simple geometry that any high school grad can do. Here are actual measurements that I took when I did my lift.
The amount it moved over wasn't even measurable.