Corner problem? RE: Rippling cones

Hey folks,

So after reading about and deciding to follow the advice from my previous post (Rippling cones) where I whined about seeing the cones in my speakers jumping around when playing vinyl,...

I decided to use a wall mount.

My room is set up with diagonal speaker placement very close to figure 2 at:
https://www.decware.com/paper14.htm

The left side of the turntable rack starts from where the number 5 is.
There is a closet door where number 6 is. Thought about moving the rack into the closet to mitigate the air borne vibrations.  Not really practical but would be an interesting experiment.

I am still new to turntables. But it just occurred to me that a corner would be the worst place for a turntable.
Especially the one closest to both speakers.

Is there any truth this? Or am I just over thinking things?

I am convinced that wall mounting is my next step and would love to keep things where they are.
But, if corners are bad, I am open to other possible locations.

Thanks everyone!