Dry and season the steak. Pat the steak completely dry with paper towels, then coat both sides with 1 tbsp olive oil, garlic powder, smoked paprika, salt, and pepper.
Prep the zucchini. Toss the zucchini planks in the remaining 1 tbsp olive oil with a pinch of salt and pepper.
Preheat the grill. Heat your grill or grill pan over high heat for at least 3 minutes before cooking anything.
Grill the steak. Cook for 3 to 4 minutes per side for medium-rare, adjusting slightly based on the thickness of the cut.
Rest the steak. Transfer to a cutting board and let it rest for 5 to 7 minutes without cutting into it.
Grill the zucchini. While the steak rests, grill the zucchini planks 2 to 3 minutes per side until grill marks form and they are just tender.
Make the sauce. Whisk together sour cream, mayonnaise, lime juice, and hot sauce in a small bowl until smooth. Taste and adjust seasoning.
Slice and assemble. Slice the steak thin against the grain. Divide rice into bowls, top with sliced steak and grilled zucchini, drizzle with creamy sauce, and finish with fresh herbs.