show ad after # paragraphs

You need a post_meta field to let an author decide after how many paragraphs the ad is inserted, if you want to do it like that, and not with a shortcode.

So create a custom field called f711_insert_after_no_p, and use your function like this:

if ( is_single() && ! is_admin() ) {
    $show_after = get_field('show_after');
    return prefix_insert_after_paragraph( $ad_code, get_post_meta( get_the_ID(), 'f711_insert_after_no_p', true ), $content );
}

Be sure to validate the input to only allow integers, or do this in the output.

I think for ACF the code (instead of get_post_meta( get_the_ID(), 'f711_insert_after_no_p', true ) ) would be

get_the_field( 'f711_insert_after_no_p' )

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