Unroll and press dough into a 15x10-in. rectangle. Transfer dough to an 18x12-in. piece of heavy-duty foil coated with cooking spray; spritz dough with cooking spray. In a large bowl, toss plum tomatoes and sun-dried tomatoes with oil and seasonings., Carefully invert dough onto grill rack; remove foil. Grill, covered, over medium heat 2-3 minutes or until bottom is golden brown. Turn; grill 1-2 minutes longer or until second side begins to brown., Remove from grill. Spoon plum tomato mixture over crust; top with cheese and cherry tomatoes. Return flatbread to grill. Grill, covered, 2-4 minutes or until crust is golden brown and cheese is melted.