Use own data placeholder in posts listing using wp posts pro plugin.

gistfile1.txt

add_filter('wpp_posts_data','wpp_posts_data',10,2);

/**
 * Modify Post's Data before placing in the template.
 * @param  array $placeholder_data Post's Data.
 * @param  int $post_id          Post ID.
 * @return array                   Modified Post's Data.
 */
function wpp_posts_data($placeholder_data,$post_id) {

	// e.g Use your own placeolder my_placeholder and get value from salary custom field. 
	$placeolder_data['my_placeholder'] = get_post_meta('salary',$post_id);
	return $placeholder_data;
}

Using 'wpp_posts_data' hook, you can use your own placeholder to display in posts listing. This is very easy approach to display any data you want to show in your posts listing.