For Rinkusu Sanshin - Confirmation

I found the following review for a similar product sold on a major online shopping site (Amazon):

Some kind of modification is necessary for the mounting position.
If you attach this product directly to a wall or similar surface, it will significantly interfere with the ten-ura (top lining) and body of the sanshin.
You will scratch your sanshin unless you insert something a few centimeters thick at the mounting position or attach it to a position similar to a tokonoma alcove's nagashi (horizontal beam). The usability is quite poor.

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Here is my question:

Is there any such concern with Rinsuku Sanshin's hook?

My study already has reinforcement in the wall for displaying sanshin and awards.
Therefore, normally, you would attach a plywood board to the wall and then attach the sanshin hook.
In my case, I want to attach it directly to the wall without installing a plywood board due to aesthetic reasons.

Does this seem okay?