Best Mounting Location For AirPort Extreme 802.11ac

Hello,

I have used various models of the AirPort Extreme over the years and always mounted them at the highest peak of the ceiling in my home. It was always stated that they transmitted in roughly 360 degrees. Now I just upgraded to an AirPort Extreme 802.11ac model and have a third-party accessory mount that is metal for the first time (see attached picture). So, this changes the game somewhat. If this AirPort model also transmits in all directions, then that might mean I need to mount it with the metal mount to the ceiling or even inverted. Of course, just an initial test with this mount on the unit and tacked on the wall upright/horizontally with duct tape shows great reception IN the whole home. I just want to get the most efficient operation with 12 acres of land OUTSIDE. HA!

So, any comment on this from those much smarter than I?

Peace,

Dr. Z.