Fuse Box - 12v Only When Key in Ignition

[phoneticsoft]

Hi, I'm looking for a fuse slot that only gets 12v when the key is in the ignition and immediately cuts power when the key is pulled out. Basically, using a fuse tap I want to add a device (Carplay/dashcam) that behaves exactly like the radio in that regard. So far every fuse I've tried either

- has 12v all the time or
- only gets 12v when the engine is running

What am I missing?

2011 E82, no Comfort Access