Yes.
See particularly Jon Osborne's videos (
Radar Detector wiring options) for dash and A pillar hints; also one other guy I can't think of at the moment. (Search around a bit for A pillar, footwell disassembly, etc. There's also a third guy who has done several videos that seem to be entirely focused on removing interior panels -- try searching on "remove trunk liner tesla model 3" on youtube.)
Watch
@Ingineer's related videos thoroughly.
The dashcam folks are the ones who have done most of the complex routing and panel removal, so search on that more than on radar. There's probably slightly more substance to be found on M3OC than on TMC; maybe 60/40. Search both.
Some threads:
Radar Detector wiring options
Model 3 Radar Detector Hardwire
Here's how to safely tap 12v power for add-ons
BlendMount Radar Detector Mount in the Model 3?
Dashcam Install Help
Dashcam Install Help