How to move ligand inside membrane to the edge of the membrane

GROMACS version: 2020.01
GROMACS modification: Yes/No
Dear Gromac users,
How can I move a ligand (ubiquinone with two isoprenoid units) centered in a 200 POPC bilayer to the edge of the bilayer? Lets say the coordinates that I want for the Center of mass of my ubiquinone is 0,0,z, where z is the center of the z dimensions for the box with the bilayer.
Any help with this is appreciated. I have tried gmx insert-molecules but it does not locate my ubiquinone where I want it.
Kind regards,