Also - don't forget. They can MOVE over your units, but can't charge.
If you go first - use your hexwraiths for 24" wall of bodies and all other army as backbone. You can spread your army so there will be no room for 110mm bases +3" all around. If they can't finish their move - they can't move, and they can't charge over your models.
If you go second - you have chances for double turn and you definitely protected from it against you.