I ran wire up to top of hatch along the inner rim, down the back of the hatch chassis along the outside of the rubber, make a drip loop at bottom of hatch, cross OVER the rubber, and into the rear right. Then tucked under the plastic rear quarters and up thru the floor channel. I put the radio unit under the US passenger (right) seat in with the other computer there, under the carpet, and left the floor channel just front of the b pillar. Requires a 1m extension for the antenna wire to reach this location with this routing. Use double sided heavy self stick velcro to attach the unit under the seat.I just picked this up and was going to mount in the same spot... How do you have the wire coming inside, where did you put the booster, and how did you mount the internal antenna?
Ran power from taps on the cigarette lighter (ACC) plug from behind the center dash, along the center console trim, and then under the carpet to the radio unit.
Ran the 'boost'/inside antenna along with the power, to behind the center console, and put it in the ashtray (not sure if the LX570 ashtray is the same as the TLC). It fits there tightly/wedged in. I have that ashtray open all the time as my amplifier volume is in there as well.