You can use the EMI filter in the US by connecting L1 to the terminal live terminal L and L2 to the neutral terminal N
in the UK the neutral supply terminal is connected to the protective earth PE
depending on when the supply cable was installed the earth & neutral is joined together
either at the 3 phase transformer star point or the utility company supply terminals
that's why its call neutral instead of line 2
one problem with EMI filters is the eath leakage currents due to the capacitors marked Cy on the filter circuit
some VFD's have a jumper to enable the user disconnect the Cy capacitors from the PE
to avoid the EMI filter tripping the RCCB / GFI
John