Done for Marie, thanks to Seb for the first experience on 3D printing long before I had my own printer.
May be printed face down, with no brim and no support.
But if your first layer isn't perfectly fine-tuned, or depending on your plate surface, he result may ugly : in that case you can also print it button face up with support, and possibly with ironing.
FreeCAD model provided.
The author marked this model as their own original creation.