Finally got around to hardwiring my radar detector and front dashcam in my 2020 V60 PE.
I removed the A pillar trim by removing the bolt under the IC airbag plastic piece and pulling firmly. 2 clips up the pillar detached easily, needed to do a fair amount of jiggling to separate the trim from the dash. The dashcam is up high, so I tucked in its cable into the roof liner, ziptied it to the other wires running down the A pillar and out of the airbag's way, then through the dash/door trim to come out by the fusebox. I mounted my radar detector (Uniden R7) low on the windscreen because everything up high (including a blendmount for the mirror) blocks my lines of sight since I'm pretty tall. So that wire hugs the windshield/dash line and then follows the dashcam wire to the fusebox.
Accessing the fusebox in the passenger footwell was pretty straight forward. The carpet is a little stiff but having the SIM access port gives you a nice handle to pull on and peel it back. The fuse box cover has 2 clips toward the front, just squeeze the sides in and it hinges towards the rear.
Finding ignition-switched fuses - in a slot where my fusetaps could fit - was the hardest part. A post about hardwiring in an XC90 said the front massage seat fuse was switched, but I saw constant power there. I wound up using the fuse for passenger seat heat and hanging both cam and radar off of that with a 5a fuse. Side note: I bought a cheap5 pack of 5a micro2 fusetaps off amazon and every single one of the fuses was broken/blown. Wasted a solid hour of debugging all my connections before checking the fuse for continuity
Wired up a 2port 12v DC -> USB adapter (1 port for the dashcam, 1 for future use) and the Uniden hardware kit and tucked everything in behind the carpet. Plenty of room back there. Then mounted the mute control on the passenger side of the center tunnel with some double-sided 3m tape. Which is the only picture I have of this entire install because I suck at taking pictures.
Next project: wiring the rear dashcam (completely separate from the front)