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Nothing much will be happy in that position. The beauty of a cedar is in seeing the whole tree, perhaps you could give us a clue why you want screening shrubs.
If you grow 3mtr high conifers you will have a big fight on your hands with your neighbours. Certainly would if i was your neighbour.
That's not the case. I'm sure the neighbours would be pleased as our houses overlook each other and besides there are mature trees all along the fence on both sides apart from underneath the cedar (whose lowest branches start at around 5m) where they're most needed. Anyway I was thinking about some big shrubs rather than trees.
Laurus Nobilis? (bay)
I don't think much would grow under a big cedar. It would rob the soil of too much moisture and it has a lot of shallow roots.