How to place affiliate ads on my Indian website?

I wanted to place Amazon affiliate ads on my website and the traffic is coming from India (100%). I wanted to know if I had to place the ads by editing all the posts or there will be a script that will automatically put ads in the articles.

Also, as far as I know, I have to choose a product from Amazon for placing the ads. Is there a feature that just shows the products based on the niche of my website/content of the website or the product which the user searched on Amazon?

Last question, how can I use these ads with the Ezoic ads?

You can use any ad inject plugin. I personally use AdsforWP

I guess there is no issue with that but it may reduce your affiliate conversation rate.