Blue Iris

This is a subnet or virtual LAN question and would probably be specific to your router.

Each card would have its own MAC id and you'd likely need to use your router to assign IP addresses to the appropriate MACs from its router portal.

Sorry this isn't a very satisfying answer.

There is another thread with folks dealing with GeoFencing. Take a peek at that. You are not alone on that item.

The developer put in a new mode to say "trigger on lack of motion" but that won't work in this scenario.

but every time I have to restart it, add storage, etc, won't that take my cameras offline? If you mean 'temporarily' offline then... Not to be flip, but... of course. How would you expect BI to record when it is restarting? If you mean long-term offline, then no. They will only be offline during th...

Your symptoms make no sense to the many many users of BI. Sorry.

Win-10 Home or Pro?

There are some very specific steps you need to go through for the V5 upgrade. I'll see if I can find them for you.

Condensation on the outside of the lens or inside?

A hood or cover won't prevent condensation on the outside of the lens I would think because condensation forms from the air/surface boundary not water falling down.

Yes, but that it not related at all to D2D. it is a separate discussion. The use or lack of use of D2D has zero impact on the NAS discussion.

My point is... it has to write to the disk regardless of whether or not you are using D2D.