Raspberry PI 4 mounting wall gizmo was designed to be compatible with the tool wall plate produced by Element System.

The tool wall plate:
https://element-system.com/en/tool-storages/storage-sets.html

Gizmo is divided into 2 parts so they can be easily printed.
1) Pillars - 4 pillars between the back-plate and the RPi
2) Back-Plate - mounting gizmo including the wall hooks.

Hooks on the back-plate shall be placed upwards during the printing. They are printed without any support easily.

There is also a similar gizmo for a SSD if you need it.
https://www.prusaprinters.org/prints/41550-ssd-7mm-mounting-wall-gizmo-elementsystem-compatib

Print instructions

Rafts: No

Supports: No

Resolution: 0.15 mm

Infill: 15%

Filament: Filament PM PLA Pearl Red