Speaker Setup.....

As mentioned earlier, and in the video, speakers likely won't be perfectly spaced apart. If aesthetic isn't important, it's the way to go. You simply focus the speaker position to your ears. 

I use Cardas.
http://www.cardas.com/room_setup_calculators.php
Acceptable  sonics throughout the room. YMMV.

Pdf? Really? In 2019? Don't they know we all use smart phones? Make your info screen adaptive.

You have a smartphone in 2019 that can't open a pdf?  What is it, one of those iphones?!

Can’t say this would be my preferred method, especially for digital playback.  I’d rather set up the speakers symmetrically and then use Roon DSP to tweak the balance or to tame a room mode under 200hz.  I think you’ll get better imaging and soundstage that way.