Camera to get, confused on focal length

I want to order one of the cameras, but I’m having trouble trying to figure out the focal distance. My enclosure is 8 inches deep. I use the Ortur 20w fixed focus. When I shut the lid, I have 8 inches between the bottom of the lid and the top of the bottom. I’d like to mount it center looking down on the lid. I’ve searched, but cannot seem to find a focal point listed anyway.

I did a test with my webcam, but it needed 40 inches to get the whole bed in… Might be useful to use it, but I thought I could get one that could mount inside my enclosure…

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