The resources that you need to distribute to your namespaces are storage capacity (total of 26.4T per-node) and IOPS.
Each of those Micron 9200 MAX SSDs was rated using ACT at 105.5X. If the IOPS needs aren’t the same, you may want to split one drive for several less-used namespaces, and allocate the remaining ones to the more IOPS hungry ones (which in aggregate have the equivalent of 316X). Alternatively, you can let them all access the 4 SSDs as a pool of IOPS, and distribute partitions (devices) depending on the space needs of the namespaces.
There is no reason you can’t have uneven partitions (in terms of size) on each SSD. For example, if you partition each SSD to something like 3 x 670G, 3 x 1TB you get a total of 24 devices to allocate to your namespaces. Make sure that a given namespace has evenly sized devices on each SSD. Another namespace, which needs less storage, can have one small device from each SSD.
If you’re an enterprise customer, please open a support ticket to discuss this in specific detail.