I can't find this mentioned anywhere, so hopefully I'm not repeating the question...
For my 'Chosen Ground' Kingdoms scenario, I've decided to defend a cliff (from the Terrain Pack) running right across the battlefield just in front of my deployment zone. Hopefully I'll do better than scenario 1, where his Dwarfs dismantled my Undead without a single loss...

This time I have Zombie Trolls...
However, I'm looking for a rule I figure, realistically, should be there, but I can't find it...
If I position my Archers in a second rank, to shoot through gaps between the front rank, and that front rank are at the cliff edge, is there a blind zone at the bottom of the cliff? can a unit 2.5" back from the cliff edge shoot at a unit at the bottom of the cliff? Would that count as Indirect?