What is the most efficient was to setup the NVMe drives, in a read only or read and write. I have seen there's differing thoughts on this subject.
The best way is to use it for the read-and-write cache if you have data often written to the NAS and accessed from a NAS.
Sometimes people only read data and not write. Read cache can be enabled for that.
If you use NAS for video editing, it is better to use it for storage and not cache.