Not the Cougar but the Ka (RU8, or Fiat 500).
It has a CD/radio (a normal DIN but the HU front includes part of the dash trim), which has an AUX input socket below the gearstick, by the front cupholder. That is also where a tiny coin cubby and the standard auto 12v socket are.
We previously had the dash trims off to run USB/power cables to the mirror/dashcam and the Tomtom satnav. I sanded and T-cut the centre console panel above the radio/below the windscreen to enable the Tomtom suction mount to adhere, this location blocking almost none of the windscreen to the driver, and the USB cable exit from a small hole made to the side of the same panel.
Son (main driver) bought iPhone to audio cable to connect his playlists to the HU, and subsequently a magsafe iPhone mount/charger.
Meantime, I had a spare bluetooth receiver and USB1.1 hub to share the 12v power amongst 2+ devices, so for a while these were hanging loose near the cupholder, and anyone could link their phone via BT to the HU. The phone mount however, wouldn't suction to the dash top nor the windscreen!
Over the past few weeks I've been building up a resin pad (cheap araldite type glue) next to the satnav, to try to make a base to suction to more reliably than to the dash top. Still couldn't get the phone mount to stay put, so son was in touch with the supplier who acknowledged the issue and are apparently sending his choice of stickypad or vent clip replacement. Five minutes later and a kettle of fresh boiled water and adhesion was achieved with the suction mount!
Anyhow, so with the cable for the magsafe charger also suitable hidden, I turned to my son's complaint that the BT device loose near the cupholder interfered with his operation of the handbrake. I had also added a spare small powerbank to the BT so the kids' phones stayed connected to it with the ignition key at off (12v socket being ignition switched, but HU operable at any time).
So with the cables poked through a discrete hole in the upper side of the coin tray, only dashcam USB, hub host USB and aux audio are cabin-side of the trim, the rest sitting inside a small plastic box on the carpet between the trim and the floor air vents, securely lidded.
