Ansys Employee

I think fix support should be enough. 

Fix support does not lock 6 DOS in all the cases, for example, if you fix an edge of a shell, it only lock the translational DOFs but still allows rotational DOFs, and that's why there is a "Fix rotation" boundary condition. 

If you are using solid elements, there is no rotational DOF for solids, so using fixed support should be fine.