Where to tag 12v Accessory and Ground?

[Venom]

Installing a radar detector mounted to my rear view mirror. I just need 12v Accessory and ground - do not need constant. Anyone know the easiest spot to tag ACC and GND?

Thanks

 

[Watts_Up]

Tesla Model 3 - How to safely get 12v for accessories

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Tesla Model 3 under dash source supplying center console 12V outlet