Easiest way to do that is by having same height and width ratio for you input as for your "screen".

If your screen is 16:9 your input signal should be too.

As for the curved in the video: It's most likely just an ulta-wide format such as 5760*1080 [Tripple Width HD]

The curvature does not affect the ratio - if this should be your concern.

The ratio of the ultra wide format I mentioned is 48:9 hence create a rectangle with 48 segments in width and 9 segments in height, bend it, and you are good to go.

(a curved screen is also just a rectangle)

There is also the posibility of stitching multiple screens if needed.

-Martin

If you are exclusively using the DE version with unreal then yes. but its not mandatory. a question of preference I'd say. In my case, I create objects in blender and import them into aximmetry and add the texture or source-input. Depends on how you work.