I would try to find a new home for the 3/DS game holder and see if it's to your liking first. If you find that unacceptable then maybe you should try mounting the sound bar to the wall. You can easily put the game holder back on the entertainment shelf and return things back to normal, the same can't be said for the holes in the wall if you decided you dislike the wall-mounted sound bar.
Yeah, especially because I think I have to buy the mounting brackets separately. I was thinking of moving the GameCube to the left side, and then putting the Switch where the GameCube is now, partly because the left side of the sound bar is where the volume indicator lights are; kinda helps to be able to see those.