How to model a plate with a curve?

I am trying to make a cupholder for my car. So I want to make a "plate" about 120mm by 70mm by 2mm with a 3mm "bow" in the middle.

I found the "Extruded Curve" shape generator, but it keeps giving me an "S" shape, rather than a simple 2D curve.

Is there a simpler shape generator or another simple way to "bend" a flat plate?

I have done the actual cupholder and even a pen holder, but if I can "bend" the plate it will minimise the gaps at the edges of the print.



PS I am very much a newbie and this is one of my early designs


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