Live ignition feed from cabin fuse box - Audi A4 B6 Cabrio

[Forestier]

Hi all,

 Live ignition feed from cabin fuse box - Audi A4 B6 Cabrio - Which fuse to piggy back? 
I am about to swap my broken Audi Sat Nav Plus double din unit for Pioneer Carplay unit.
The suppliers of the installation kit say I may need to provide a new power feed controlled by ignition on.
I read an installation guide on another forum & it suggested using fuse position 19 in dash end panel box.
He showed how to use a piggy back fuse holder & lead to tap this fuse slot.
Looked easy but, in my car, position 19 is empty & has no supply cable.
Can anyone suggest a suitable fuse position to tap by referencing the photos below?

Thanks in advance!

[Forestier]

Anyone?