GPT AMP Ad Code

Hi,

I have been trying to find out how I can monetise the AMP pages.
I have implemented the official AMP plugin

As per google admanager, one of the ways to insert GPT AMP ad code is through insert header and footer, which I have implemented too.

This is how I have implemented https://ibb.co/2dZ4rVt
Request if you could guide me the optimum way of implementing the same and may be guide if I can implement more than 1 ad unit.

Thank You
NJ

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