Flat and curved surface mounts are two ways of mounting systems that attach light to vehicles' surface. Flat surface mounts are the most common style. Curved surface mounts are less needed, Sometimes people will install the light on the corner of the car.

V series lights can be not only in flat but also curved surface mounts. It has 3 leds, 4 leds and 6 leds types.It has a 3M tape on the back for the drivers to mount on any surface of the car easily.
The V series light has a soft body. It can be mounted on curved surfaces by different angles. Especially the 6 LED module. It is long enough. It uses PC lens and PP material.

Both flat and curved surface mounts have their situations when you are going to mount some lights on the car. Flat mount is easy to handle with and curved mount is much more flexible. It will let you have an adjustable angle to use a warning light.