If you're in the trade then why can't you tap into the fuse box and piggyback 12v off one of the accessories? That's the easiest option and then run the wire through the trim A pillar, in fact you don't even have to remove the trim. If you have basic DIY skills, it's very feasible!

~Alex

 

Been a panel beater for 35years so I have basic diy skills 😁 I wanted methods for positioning the cameras an didn’t want to disturb an other sensors as it is top model so packed with them.