If you're adding them to the standard wiring for parked up use remember that they will time out (20 mins as standard, sometimes 1 hour if factory fit LED cargo Transporter)
On a T6 you can alter the time delays with something like VCDS up to about 2 hours; so far I don't think anyone as found where this setting is on a T6.1 (as I'd love to do it)
"Standard" courtesy wiring is three wires: timed out +12v feed, one negative feed to the door switches, one permanent negative feed.
Some cargo wiring only uses 2 of those as there is no "always on" switch on the lights.