How to do two 4k recordings simultaneously?

Hi there!

We have two 4k cams connected to our Pearl 2 so that we can create recordings from different perspectives.
To save time it would be great if we could always record with both cams in 4k at the same time, and then decide which perspective to use afterwards.

With which settings could this be achived best with 4k and 30 fps?
Is there a best practice recommendation for this?

With kind regards