I have a new U7 Pro which I would like to mount on top of a cabinet in the same way as my old U6.

Wall mounting or lying down is not ideal here, the other models for screwing the original backplate require screws that I don't have to hand.

The U7 Pro stands well in it, but a poster strip can be attached to the top of the holder for even better stability.

I already had such a solution in use with the old U6 Pro for over 2 years.
Note: the U6 Pro also fits in, but has a slightly smaller diameter - the poster strip should definitely be used here for better stability.