These are rather expensive Custom Prestige Anti-Theft plates that I bought from VicRoads 3 years ago when I intended to buy the last of the normally aspirated 6.3L Mercedes-AMG engine cars.
They have a separate mounting bracket, so no screws appear in front of the plate.
Should you buy the plates, you would have the option of changing the colours, width or style.
Perhaps these may be of interest to someone who doesn't have a MB-AMG 507 engine car, but simply has initial of MB.