I created this single Screw BL-Touch mount for my Ender 3 V2 since the fan duct is blocking the other screws.
https://www.printables.com/de/model/512574-single-screw-bl-touch-mount-for-ender3-v2
I'd be careful doing this, as the sensor could pivot. I had a mount that did this and I felt like I was constantly having to mess with my Z offset