Did you ever use Room EQ Wizard (https://www.roomeqwizard.com) ?
This helps a lot to analyse your room / speaker and speaker position.
I use it also to analyse any location we play right before the sound check, to find out resonance and best EQ starting point.
That looks fantastic! And the microphone is much cheaper than I'd expect for that kind of use.
Definitely something to consider. A little complicated but it's sure worth.
Seeing the second video, the man says when you start the test you should get away so your body won't interfere with the measurements. I think: shouldn't you be right there? You're supposed to be there, interfering with the sound, when you are... there.
Just kidding (a little kidding and a little serious). Yes... That's the way my mind works.
Thank you very much. In a few hours I'm going to get a Headrush FRFR108 at the local shop and I'll ask for the mike.