Heat a large skillet over medium heat. Add flour; cook, stirring constantly, until flour is deep golden and smells toasty, 7 to 10 minutes. Reduce heat if browning too quickly. Transfer to a 6-quart slow cooker.
Add oil, bell peppers, onion, and garlic to the skillet; cook and stir until tender, 5 to 7 minutes. Stir into slow cooker until coated. Stir in sausage, tomatoes, broth, Cajun seasoning, salt, and black pepper.
Cook on Low for 6 to 7 hours or on High for 3 to 3 1/2 hours. Stir in shrimp; cook until opaque, about 30 minutes on Low or 15 minutes on High.
Meanwhile, place riced cauliflower in a heatproof dish, cover, and microwave until heated through, about 4 minutes, stirring halfway through.
Serve gumbo over cauliflower. Sprinkle with parsley and additional black pepper.
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