TomTom One XL I believe is the same height as mine (TomTom One).
I ran the 12V cable from the cigarette lighter in the front up the inside of the console. When you take the console out there is a large hole in the side near the air vent, and you can run the cable into that. This brings you out above the head unit. I then cut a hole in the bottom of the cubby to thread the cable up and secured it with a clip to stop it falling back down. If you have long thin fingers like me you can then put the Tom Tom in and insert the cable. If you dont you could cut the front of the cubby away to give you more access as there is a plate that goes over the top of the front of the cubby anyway.
It is very tight in the non JDM cubby to fit the TomTom and cable without cutting a hole I found. .... hope this helps
I should have taken phots but I was balancing the console at the time