How define elements order

You can use the content_top_{page slug}() method.

public function content_top_YOURPAGESLUG( $top_content ){
    return "<h2>Before page title</h2>"
        . $top_content
        . "<h2>Before form</h2>";
}

Also the method name also serves as a filter hook. So you can do something like

add_filter( 'content_top_YOURPAGESLUG', array( $this, 'getTopContent' ) );

public function getTopContent( $top_content ) {
    return "<h2>Before page title</h2>"
        . $top_content
        . "<h2>Before form</h2>";
}

Replace YOURPAGESLUG with your actual page slug.

Hope this helps.

Awesome!
Thanks ??