Both parts need to be printed. It fits perfect to a German flush mount box (Unterputzdose).
I used the following power supply:
200614_Wallmount_SM-T510_BajonettDose_v26.stl | 221.7KB | |
200614_Wallmount_SM-T510_Tablet_v26.stl | 196.5KB | |
200614_Wallmount_SM-T510_v26.f3d | 987.5KB |