Fine Tune Instance Location

Nevermind! 😀

function my_attachments_location_limit( $val ){
    global $post;

    $frontpage_ID = get_option('page_on_front');

    // we only want this instance to show up on the home page
    return ( $post->ID == $frontpage_ID ) ? true : false;
}

add_filter( 'attachments_location_mns_slideshow_meta', 'my_attachments_location_limit' );