I tried it placing it after an IK node like FABRIK and it does have an effect.
It is a bit like the constraints you can apply within PhAt, so the XYZ values essentially map to Swing1, Swing2 and Twist if I’m not mistaken.
For your case I wouldn’t use the limits but rather ensure that the pose is correct differently.
It’s not very intuitive to use, but it does things 
Good luck!