wall mount for a 2016 30rkdd

Just picked it up Saturday and was looking at the place that says wall mount here. It seems hollow right behind that area. The guy doing the walk through said that's just the center...it is 8 inches up and down from there. What mummy do you suggest? I think I would put in no more than a 24 inch tv since the living room has a 50in.
 
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