Turn screen off if tilted a certain way

• Device is vertically upside down.


• Device is locked in Portrait mode and horizontal.


• Screen is facing the center of the Earth.

I suggest you try Automate (user guide) as well as Tasker (free trial; user guide). Both of them offer the features you're seeking. A peek:

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Before I leave you here to tinker with those options, here is some information to ease the tinkering:

In Automate app:

• Device Orientation block can be found under Sensors.


• Device lock can be found under Interface. Practical usage requires setting Automate as device administrator.

Tip: It is easy in Automate to trigger an action on a prerecorded motion gesture

In Tasker app:

• Orientation trigger can be found under State → Sensor.


• Display Orientation trigger can be found under State → Display.


• System Lock action can be found under Display.

Tip: In Tasker you can setup multiple contexts.