Heat delivery vents of wall-mounted fireplaces can either be at the top or bottom. It is, therefore, required that you consider what you prefer between the two before you purchase a unit. You need to consider any furniture, plants, as well as other items within the area of your fireplace. There are fireplaces that have TVs mounted at the top or bottom of the heating devices. Typically, there should be a 3-ft gap in between a flat-screen TV and an electric fireplace.