The orientation does not matter. As long as the fresnel lens is positioned back of the groundglas, at the photographer's side.
For protecting the lens surface mounting the plain side of the fresnel lens towards the photographer is advisable.
That would mean you you are considering installing the fresnel in front of the lerns.should the smooth side be towards the viewing screen or towards the lens panel side of the camera? Both options seem to be possible.
In general: No.
Unless the camera is designed this way.
In case there are rebates or such at a fresnel, the proprietory mounting should be used as different mounting could change position of the ground surface of the ground glass too.
Basically the focal lenght of the fresnel lens must be chosen with the focal lenght or rather the exit angle of the taking lens in mind. But to my knowledge this ist not done in LF photography.