Preheat broiler to high, with oven rack set in upper-middle position. Line a rimmed baking sheet with foil and set a wire rack on it.
Sprinkle cod fillets with ⅛ teaspoon pepper; arrange on the rack on the prepared pan.
Combine teriyaki glaze, 1 tablespoon oil, ⅛ teaspoon salt and ⅛ teaspoon pepper in a small bowl.
Brush 2 tablespoons of the sauce over the fillets (reserve the remaining sauce for serving). Broil the fish until it flakes with a fork and an instant-read thermometer inserted into the thickest part registers 145 degrees F, 4 to 8 minutes (depending on the thickness of the fillets).
Cook cauliflower rice in the microwave according to package directions. Stir in the remaining 1 tablespoon oil, ⅛ teaspoon salt and pinch of pepper. Divide the cauliflower rice among 4 serving plates, top with the fish and serve with the reserved sauce.
