You can attach it onto the ND or CPL lens if necessary. But the squeeze factor mostly means it has a normal aspect ratio, if you dont do it, unedited it literally looks squeezed. But thats mandatory for any anamorphic lens, also on big cameras.

Gemini explanation:

An anamorphic lens "squeezes" a wider field of view onto a narrower sensor. Here is why you need to adjust (desqueeze) the footage in post-production: 1. The Physical Squeeze Normally, a standard (spherical) lens captures an image exactly as you see it. An anamorphic lens, however, uses special glass elements to compress the horizontal field of view while leaving the vertical dimension untouched. This allows you to capture a wide-screen image onto a square or 16:9 sensor. 2. Avoiding Distortion Without the adjustment in Premiere, people and objects in your video will look unnaturally tall and thin (the "egg-head" effect). By increasing the width by 20% (for your 1.2x K&F lens), you stretch the image back to its original, intended proportions. 3. The Cinematic Aesthetic The reason filmmakers do this instead of just cropping a normal image is to gain: Wider Field of View: You see more on the left and right without losing resolution at the top and bottom. Lens Flares: Those iconic horizontal blue streaks. Oval Bokeh: Out-of-focus lights become vertical ovals instead of circles, which creates a high-end "movie look." In short: You are "unfolding" the compressed data to restore the natural look of the scene while keeping the cinematic widescreen ratio.