AAV location on urinal waste pipe

Looking for suggestions on the best location for a AAV on urinal waste pipe. The pipe runs about 3-4 meters (also is plumbed to a basin) before going into the toilet soil pipe, this enters the drain into the ground.
I feel there isn't enough ventilation which is restricting flow hence my question, my thoughts are it should go as near the end of the run as possible? Before it enters the soil pipe.
Thanks for your help in advance.

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