Inserting a molecule at a specific distance from another molecule

Dear gromacs users,

I am working with a micellar system and would like to study the transport of small molecules through the micelle. For this purpose I want to insert some small molecules and run an MD simulation to see if they are entering the micelle. In order to remove positional bias of placing a molecule very close to the micelle, I want to add the small molecules at a minimum of > 1.5 nm away from the micelle. Is it possible to do in gromacs? Any help is much appreciated.