Hi Stella,

Thank you for your inquiry. the panels are fine behind the tv area but not recomended right up to the gas fireplace, If the panels are about 12" away from the opening then should be fine but if the area surrounding the section for the panels is too hot i dont recommend as they can warp overtime with the high heat.

If you need the panels that you requested which would be full size samples please let Houzz know to send me your address and i can ship the samples out to you.

thank you again