Drip requirements - Oleander

Poway, CA

Hello,
I want to use emitter tubing, 18" spacing, 0.9GPH on a long hedge of Oleander. The plants are spaced about 5 ft apart and are very established and kept about 7' tall. There is a very slight elevation change from back to front. Could I get away with only one line of tube behind them (maybe 6" from the base) or should I put one behind them and one in front?

Thanks!

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