Looking at the installation manual here:
https://www.neff-home.com/uk/supportdetail/product/H5642N0GB/02#/Tabs=section-manuals/
The surround appears to be clicked in place at the four corners.
One would be forgiven to assume that a determined application of a stout bleed would be sufficient to remove one corner at a time.
One caveat: if you break it you get to keep all the pieces
Ejdjdh, March 2023