If you have a couple of classic V2 cameras like these
and install both instead of cameras from your Deluxe kit, they should work without any additional settings.
You mentioned "but so far if I plug one in". You need to connect them both. If you connect one V2 camera and one V1 camera, system will have a problem (as under the hoot Raspbian use different drivers for them).
If you connect the only one camera, you need to set "2D" mode in admin panel.
Am I right understand you, that you use a classic V2 cameras with wide-angle extension like this one?
(you can read our article related to wide-angle V2 cameras here in our blog
If yes - they should work out of the box too.
Another point - you can use a special edition of wide angle V2 cameras from Soho Enterprise, like these:
In this case you need a special edition of dt-blob for these cameras to work.
And the last notice.
If you have access to admin panel, you can go to the web-based bash:
(we described how to use it in this article
So you can stop our scripts (/opt/StereoPi/stop.sh) and look, how system see your cameras, typing a command
This command will show you two numbers - "supported" and "detected" cameras. If your "detected" number is not 2 but 0, it means you need to check the connection. Please share your results here.
Eugene a.k.a. Realizator