Much seo friendly

If You want, You can change code in blocked_ads_notifier.php to make plugin much SEO friendly and place javascript code in footer.

/*****************************
* Front end scripts and styles
*****************************/
add_action('wp_enqueue_scripts', 'banl_scripts');
function banl_scripts() {
	//Scripts
	wp_register_script('banl_advertisement', plugins_url('assets/js/advertisement.js', __FILE__), true );
	wp_enqueue_script('banl_advertisement');

	//Styles
	wp_register_style('banl_styles', plugins_url('assets/css/banl_styles.css', __FILE__));
	wp_enqueue_style('banl_styles');
}

to

/*****************************
* Front end scripts and styles
*****************************/
add_action('wp_enqueue_scripts', 'banl_scripts');
function banl_scripts() {
	//Scripts
	wp_register_script('banl_advertisement', plugins_url('assets/js/advertisement.js', __FILE__), false, false, true );
	wp_enqueue_script('banl_advertisement',plugins_url('assets/js/advertisement.js', __FILE__), false, false, true);

	//Styles
	wp_register_style('banl_styles', plugins_url('assets/css/banl_styles.css', __FILE__));
	wp_enqueue_style('banl_styles');
}

https://www.ads-software.com/plugins/blocked-ads-notifier-lite/