This thread was very useful:
https://f30.bimmerpost.com/forums/sh....php?t=1575292
I need to extend my Viofo three wire hardwire kit as not long enough by about 1.5m but then will use one of the three circled fuses that indeed only come on when ignition is on then go off without lingering for the accessory wire or in Viofo's case the yellow wire.
I will then use the permament battery wire (red for viofo) on one of the larger fuses to the right. I'll use the top most one in my case. I tested them and they are always on.