Sophos APX radiation pattern. What is the correct orientation?

Sorry for this noob question. I am a bit confused about the radiation pattern of APX access points. I came across some debate about "wall mount vs ceiling mount" so I search the Sophos APX documentation for the radiation pattern of the APX access points and I found some diagrams for "Horizontal" and "Elevation" radiation patterns. But I am not sure which side of the APX Access Point is the "Horizontal" and which side is the "Elevation". I've included the image of the radiation pattern with possible device orientation below. I edited the image and inserted the Sophos APX device images of two different orientation. Can someone verify if it's correct?