Aaron, I'm afraid the quality of the answer is directly related to it's length.
I fully concur with Jens summary
https://www.gearslutz.com/board/7268743-post93.html
Some nuances.
FR and other response vary radically over fairly small distances.
To get a sense of what is happening with the sweet spot you need several measurements.
Dirac Live uses 9, Rod has mentioned using 40 or so.
To shake the old nose habit I suggest starting with a least two positions.
Where the ears will be.
If you want to detect the speaker response primarily, point a Direct Field Mic at the tweeter or acoustic middle of the speaker.
Mic half a head to the left, pointing directly at Left speaker, similar for Right.
You can use the software to combine L+R measures or you can do it organically...
While the Mic is in each spot, it is easy to hit that Mono switch, drive both speakers to get a real L+R reading.
View these Left (L+R) and Right (L+R) 20-300H only. They will have horrible comb filtering at HF, which the ear does not.
If you are trying to identify reflections, I would point the mic in the direction of interest.
The Diffuse Field mics are not common. Mics in US standard SLM's are Diffuse Field, but we have found serious problems trying to use them for measurement.
The advice to point the mic upwards is fairly irrelevant (unless you want to ignore the HF from both speakers equally and focus on ceiling reflections)
Many of the guides still suggest it. That and driving two speakers.
It leads to perpetual motion confusion.
More simply put. With a normal Direct Field Mic, point it at what you want to hear. DOH!
DD