USB C Port connection help required

[JeffL]

I've just fitted a phone cradle mount to my GS300 MKIII and I have it connected to the plug-in cigar lighter port so as to keep the phone charged. It's okay but I'd like a neater job, so could anyone on here give me step-by-step instructions/diagrams specific to my car on how to connect a permanent USB Port (preferably without dismantling/removing parts too much)? I've not done anything like this before so it might be better if I employ an auto electrician but thought I'd see what's involved DIY first. 

The port would be one of these or similar: 

https://smile.amazon.co.uk/gp/product/B08SJ3745V/ref=ox_sc_act_title_2?smid=A302DF5PZN13YK&psc=1

https://smile.amazon.co.uk/gp/product/B07NV6XT41/ref=ox_sc_act_title_1?smid=AHM583H6ZD5FZ&psc=1

There is a dummy port hole just below knee height and above the foot pedal which I could possible use, photo attached.

 

 

[Herbie]

This may help but there will be others on YouTube if this one doesn't do it: