I am using the Andair separator mounted to the left side accessory pad cover. I fabricated an angle bracket from aluminum and drain back into a hex fitting directly below.  this allow for the highest location for drainback. It works well but breather tube location and design took some experimenting to solve a siphoning problem.  Keep the end out of the slipstream.  I used a piece of straight aluminum tubing attached to the firewall. Place some vent holes to break any siphoning force.