…quite correct, actually you should go as far down as possible and only have a picture of your work area, the centering of your camera itself looks perfect. It is possible that your angle you indicate is not the right one, but you can test that yourself.
Regarding the language, you do it just as well as me, I also use google translate to write in English, or no one will be able to read what I mean 
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On the Chinese sites there are lenses for these cameras but also adapters (camera m12 mount for example) for the lenses but also lens supports, the price is incredibly low, you can also choose the Fov angle, which allows you to lower your camera, there if there is a draft it moves even more!! On one of my posts I put photos of these supports and lenses. cordially it is also hard for me to write in a language other than that of Molière!
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Unfortunately, I constantly have problems with orders from China, I think it’s more a problem with my post office where customs clearance takes place. Several times I ordered things that may be unfamiliar to the average person. Even if VAT and customs duties were not charged, I paid for inspection and storage in the warehouse, which were sometimes equal to the cost of the parcel, and the worst thing is that in this case there is usually a delay
for two weeks.
you can try to find them on amazon
I have tried everything I can and have come to the conclusion that the problem is still in the camera. Look at these two photos, one of the Acer camera that I used initially, the second of the camera that I bought for testing Hickvision DS-U18. The image from the ACER camera clearly shows the curvature of the guides that I used for the desktop. No manipulations with the tilt angle helped me. I assume that this is a factory defect and the camera matrix is not perfectly aligned with the PCB and lens. The Hickvision camera does not have a similar defect and therefore the image is not distorted. I am not 100 percent sure, but as far as I am concerned, this could have caused problems with constant image shift. I will try to calibrate the new camera, but the problem is that it requires USB 3.0 for a 4K image, and it is designed for video conferencing, so it has large horizontal and diagonal viewing angles, but a small vertical viewing angle. To capture the entire work surface, I had to hang it at maximum height. I’ll try what I can get out of this and post back.
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Can you drop the link? I found such a camera, if I order it today, I will have it tomorrow. The seller put the wrong description, so I am waiting for real photos from him.https://allegro.pl/oferta/kamera-internetowa-usb-2-0-do-komputera-8mp-autofocus-mikrofon-16545430032
Still, the problem was in the camera. After reading the forum, I had a suspicion, but still thought that I was doing something wrong. On the new camera, the lens calibration for each point was carried out the first time. With the desired result of less than 0.5, for all points it was in the range of 0.01-0.17. This is despite the fact that the height of the camera suspension is 1.7 meters, and without a USB 3.0 cable the image is limited to 3.7 megapixels. After calibrating the lens, I carried out alignment, the superimposed image is flat without distortions. Everything matches with an accuracy of 1-2 millimeters. Thanks for the help guys.
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I am sincerely happy for you, maybe you could put a link for your camera, in order to help people, Kind regards and good engravings,
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