We use the Ford Upfitter Switches (factory option) to power everything on our dash. The switches (in the cab) control relays under the hood that power wires under that relay box. These wires (from the relay box) need to be connected to another set of wires that pass through the firewall and terminate at the passenger kick plate on the right side of the truck.
From there (passenger kick plate wires), I wired up behind the dash and across to the center of the dash where the removable dash tray is located. For the dashcam, I used a hardwire kit and wired it directly to the wire bundle at the firewall/kick plate. For the other items I wired in DC power plugs (a.k.a. cigarette lighter) adapters, and just plugged in the GPS and Furrion power. Later, I put a splitter on one of those to also power the TPMS (via USB Charger Adapter).
The location of the under-the-hood devices (relay box and pass-thru bundle) varies by make, model, and year.
This is how our 2017 F350 was wired:
This is how our 2022 F450 was wired, which was much easier than the F350. (the video below will start at the dash wiring when played)
For both the F350 and F450, the adapters were wired under the dash by running a wire from the pass-thru (DC +) and grounding (DC -) to the piece of the frame under the dash tray.
Additionally, you can find a TON of videos on youtube that go into more detail.