Before you drive yourself crazy, why don't you bring your concerns to Best Buy and question them about it and see if they will take responsibility if there is any damage to your TV because of the installation now and in the future.
I had a TV mounted on my wall years ago by Best Buy, granted it was not the size you are dealing with, but they were professional and even with all the added things I've attached to the back of the TV it is still up there.
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