Upholstery and egg crate type foams will not be rigid, and may not be flame retardant. EPS and XPS construction insulation foam are lighter weight, more rigid, and could be covered with batting and fabric. They come in 4'x8' sheets, but can be cut with a utility knife into smaller sizes. They are available from a big box home improvement store like HD or Lowes. Not sure if they are flame retardant. Depending on how large a piece you are mounting, I would think they may be light enough in weight that they could be mounted to the wall with 3M removeable hangers of some sort.

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No chipped stone what would be the purpose of that ? Get a nice T.V stand depending on your style ( we have no clue ) then mount the TV at proper viewing height which is the center of the screen at eyellevel when you are seated . I love the Besta system from Ikea but it is very contemporary so when deciding on stand make sur eit is low to allow proper TV placement