Hey everyone.We are installing one of these units. I have thoroughly read all the installing literature on these units. Our installer who has yet to install this unit said he doesnt plan on placing a block off plate above the firebox. After reading all these post about how important it is Im thinking I should demand that they place one of these. What does everyone think? He said that they just pack the insulation around the top and insulate the stainless liner. I really want the best install for my money. Whats everyones opinion?