Last year I cut mine in half lengthwise ie through the stalk bit and laid them out ,one layer only on trays then put them on the dashboard of my car in full sun facing south for two days with the windows up. Then I froze half and put the rest in jars of olive oil with various herbs and garlic. Works best with plum tomatoes.
Everyone who has tasted them has been impressed. Personally I can't stand sun dried tomatoes.
By drying them in the car there are no insects bugs etc