I tested this filter on a Samyang 85mm F1.2 and a wide angle, it screws perfectly and then rotates without problem to direct the effect.

This type of filter makes it possible to break the plane of focus with therefore the central band not impacted (in theory) and then the sides on which the diopter filter plays the role of a magnifying glass.
It allows you to make various effects such as breaking the focus on the sides of a subject when the scene is remote, but it also allows you to put a subject back into the near macro level of sharpness while also having the central sharpness on a more distant point.
This can be seen quite clearly on my first test photo where we have a sharp first plane then blur then again a sharp plane then again blur, on the second I have a macro branch on the sharp side (as much as possible) then the focus 15m further in the center.
And the effect is therefore symmetric depending on the orientation of the slit in the filter, enough to place an element close to the ground in landscape mode plus focus on the horizon and blur what is between the 2 planes.

After there are some limitations, at an aperture of F1.2 almost impossible to have the slightest sharpness anywhere and regardless of the focus distance with this filter, I went down to F2.8 for these photos and even then there is a strong diffusion effect, especially in backlight.

With a longer focal length the filter tends to blend better into the image while with a wider angle it will start to be more pronounced in terms of the delineation between the glass on each side and the void. With lighting from the front or very slightly out of field that aims at the lens, we can also have games of flares and reflection/refraction.

With ideas there will be quite a few interesting things to do with them so.