Preheat a grill to medium-high heat.
For the lime salt: Add the kosher salt and lime zest to a spice grinder. Pulse a few times to combine. Set aside in a small bowl.
For the spicy mayonnaise: In a bowl, whisk the mayonnaise, chili sauce and lime juice together until combined. Set aside.
For the corn: Grill the corn until lightly charred on all sides. Cut the ears in half and transfer to a large bowl. Toss with the Monterey Jack and some of the spicy mayonnaise to coat, using more or less mayonnaise to your liking.
Stack the corn on a large plate and sprinkle with the lime salt. Garnish with lime wedges, cilantro leaves and extra cheese if you like.