Primo Ceramic Heat Reflector Plates for Primo Oval XL Grill. Whether you’re slow-roasting a turkey; baking chocolate chip cookies or smoking salmon; the Primo® ceramic Heat Deflector Plates will truly enrich your indirect cooking experience on a Primo grill and smoker. Set both d-shaped plates side-by-side on your Lower/Drip Pan Racks to quickly and easily transform the entire grill into an oven or low temperature smoker. 2 plates pers set for Primo Oval XL.