Make An inquiry

Goodday Rank Math,
I am an owner of 27 Newly websites and I would Like to purchase the premium SEO Plugin. I want to make an inquiry regarding 2 Questions.

1) Regarding the Rank Math Instant index. Can I use One API key to verify all the 27 websites…..(All my websites are verified on Google search console and I added my API Email as the owner on all the 27 websites)

2) According to this URL https://rankmath.com/kb/how-to-automate-the-insertion-of-focus-keyword/ on How to automatically add focus keyword… The question is after I have made the configuration. It will add the title as a focus keyword on all the posts that don’t have one using this.
/**
* Function to automatically update the focus keyword with the post title, if no focus keyword is set
*/
function update_focus_keywords() {
$posts = get_posts(array(
‘posts_per_page’ => -1,
‘post_type’ => ‘post’ // Replace post with the name of your post type
));
foreach($posts as $p){
// Checks if Rank Math keyword already exists and only updates if it doesn’t have it
$rank_math_keyword = get_post_meta( $p->ID, ‘rank_math_focus_keyword’, true );
if ( ! $rank_math_keyword ){
update_post_meta($p->ID,’rank_math_focus_keyword’,strtolower(get_the_title($p->ID)));
}
}
}
add_action( ‘init’, ‘update_focus_keywords’ );

What if I forgot to add keywords on New post will it help me update them???