Mdp options for umbrella sampling of protein units rotation

GROMACS version: 2018.4
GROMACS modification: Yes/No
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As stated in the title, I want to do umbrella sampling while rotating two protein units at the same time. How can I give the mdp option?
Is there no need for the enforced rotation option? And do I only need the pulling option?
Also, Is the angle-axis suitable for pull-coord1-geometry?