Fb instant articles Audience network

I have Three questions:

1 – If I enable google analytics in AMP for WP plugin, will it only work for AMP pages? Will I have to enable it on my site separately? If I have to enable it for my site separately then will the two interfere?

2 – Inside the Facebook Instant Articles there is an option to enter Audience placement ID but there is only one field. One placement ID will mean one add per page?

3 – Under it says enter your Analytics script code and under it, it says, Do not enter iframe tag. Can you please give an example of the code to add? I am confused on which code to add.

Thanks in advance, and btw an awesome plug in. Loving it.