Adding an auxiliary fuse box---best place to tap to a switched fuse slot or wire

Gents,

Good morning. In order to maintain the stock look of my interior as much as possible, I purchasd and in the process of installing this 10" front/rear view mirror camera system so that I have a back up camera capability without taking out the Business CD stereo (I want to retain the stock look).

For any non-standard devices in my vehicles, I always install an auxiliary fuse box along with a relay that's switched by a switched wire (like the ignition wire or from the fuse box). I have a spare Blue Seas fuse box that I took of my 2014 VW TDi (yes, it was bought back by VW because of their cheat software scandal---was a great car though!)

Auxiliary fuse box

Two questions:

1) In the glove box fuse panel, is fuse #26 (the one used for garage door opener) the best fuse slot to use as a switched source?

2) If not to #1 above, does anyone have a chart for a 2003 that has the color of the ignition wire in the steering column or an alternate place in the vehicle to tap a switched wire?

I like that unit!
You can for sure find a switched +12V source in there somewhere, even the light in the glove compartment could be a source of power.
Other who have rigged electrical connections in that fuse box may have more specific ideas.
Show us what it looks like once installed.
Good luck