Tips to fit mesh eyes:
1- Wear the mesh eyes.
2- Pose your avie straight, and pose your eyes straight (I use anypose HUD to look straight, Also Ikon eyes comes with HUD makes u look straight, you can get any HUD of these).
3- Right click the right eye and edit, Shit click the left eye, you will get both eyes selected.
4- Fix their height, then fix their depth but don’t put them right on the very edge. just a tad before the edge so when they move they don’t go out of the face.
5- To move them right and left.