Hi,
I just saw a beacon placement that I don't believe is the intended design for this map.
In the Nod Base, there is the tunnel that goes from the field to the Refinery,
However just before you leave the tunnel to go to the Refinery, you can place a beacon along the wall nearest to the Air Strip, and this spot does hit the Airstrip.
I haven't managed to get a Screenshot, but when I get 5 mins, I will try to get one.