Smoke detector mount for curved round bars (FreeCAD)

Drilling holes in the ceiling is not possible where I currently live. So I made this to mount the smoke detector directly to a lamp. The hooks are modified so that it fits to curved bars.

The screws should be lubricated a bit, otherwise the friction can be pretty high.

Print setup I used:

• Filament: PETG clear
• Print settings: default 0.15 mm Quality
• Supports: on build plate only (hooks lying on their side for better strength)