You just need one fuse tap.

I kept the ibus adapter right under the radio inside the day so All I had to run wire wise was the fuse tap. I think I added a small piece of wire to it. Maybe 1 foot of wire at the most. The adapter doesn't use much power so you can even use speaker wire.

As for the rear camera I put what I used on my install page on my site but I still would like to find something with a wider field of view.

I don't think the trunk latch ones fit. I know the reverse light ones do not fit for sure.

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Just BMW's - All cars and trucks was two pages long
1994 318is
1997 528i
2000 323i
2001 X5 3.0 auto
2005 X5 3.0 auto
2011 535xi auto
2013 X5 xdrive35 Turbo
More are at my website

Aftermarket E53 Radio Install