How much acoustic room treatment

OK. Maybe the video didn't show that. I like the design of those panels, just not the adhesive procedure.

You'll know when you hear it.

I've been at this for years. I never used any additional method other than listening. It has been a long but learning, journey. I think this is the best way?

Holes are easy to fix....

Sorry for the late response, traveling. The name of the traps vendor is Real Traps.
MK

The least amount is best.  Surrounding the area adjacent to the speakers with damping has not been beneficial in my experience. Read the thread by Michael Geen on tuning the room.

 I purchased a new summer home that has a large great room and setup some old B&W speakers that never sounded that great in my current winter house.  The room is fairly lively, but man do those old speakers sound like they never did before. There are no room treatments.

Returning to my winter home for a few days in which extensive room treatments are deployed I’ve decided the room is indeed too dead.  I removed one tube trap and one 4x8x4 bass trap, added one 2x2 diffuser on the back wall where the big bass trap resided and sure enough the system sounds better.

 I would surmise that like most things, moderation is best.

Often when tuning one need to over-tune then 'dial' back to identify the 'ideal' ( given that, in reference to room tuning, the ideal is an average across recordings).