I would recommend installing the system on the fastest drive.
For most, if not all sample libraries, you probably won't see huge changes un real life scenarii, as most ssds are plenty fast enough.
You can test it however, by installing a library on the ssd, measure time to load a project, see cpu utilization, then move it to the nvme, and measure again.
You'll need to set up the player 's configuration accordingly.
There are both ssd and nvme settings in the Opus player. Can't remember for Kontakt.
