Mexican Street Corn Loaded Tots

Name: Mexican Street Corn Loaded Tots
Ingredients: 1 cup apple cider vinegar; 2 tablespoons sugar; Kosher salt; 1 large red onion, sliced thinly; 1 28-ounce bag frozen tater tots; Kosher salt and freshly ground pepper; 2 ears yellow corn, kernels removed from the cob (or 1 1/2 cups frozen kernels); 8 ounces mozzarella cheese, shredded; 6 ounces queso fresco, crumbled; 1/2 cup fresh cilantro, roughly chopped; 1/2 bunch scallions, sliced; Lime wedges, for garnish; 1/2 cup sour cream; 1/2 cup mayonnaise; 1 teaspoon chili powder, plus more to taste; Grated zest of 1 lime