Adsense on main page

I am looking for a script that I cam impliment that will allow me to have an Adsense as show after 2 post.

I would like this to be possible without having to manually do it every time.

Ex. Every time I post no matter how many times I always get an ad placed after 2 post. Such as on https://gadgets.fosfor.se/

It shoudl only show up on the main page not the comments section as well.

Can anyone help with this?

https://www.simplywondrous.com