This layout: http://cocland.com/base-layouts/th9-war-base-triton-anti-3-star
(IMPORTANT: Deploy earthquake first. It deals percentage damage and therefore more if placed at start. If you place it last, the air defense may not be destroyed leading to a possibly flunked attack.) Now place your dragons in a line along the side with the last remaining air defense. Finally sit back, relax and enjoy the show.
Thanks for reading and if this is not a good enough formation for your site I 100% understand. If any informayion is missing etc. please don’t hesitate to contact me.