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Active noise cancellation for a yard next to highway

I have a house next to a highway and I was going to setup an active noise cancellation setup outside to cancel the highway noise so that the yard would be quiet.  I was wondering if somebody could give me an idea of the zones I need to create.  Should I use more than one board, or should I attach multiple speakers and microphones to one board.  Should the speakers just face the highway or do I need to have speakers facing multiple directions.  I would appreciate any feedback greatly.

Thanks

Alex