If the physical disk (RAID or single disk) is just one, having multiple logical drives won't make a different but slow, not much (probably won't even notice since it's SSD), things down.
It makes sense to have multiple disks if each logical disk has a physical of it's own.
You can create the multiple logical disks if you want to "separate" things (OS and SQL, tempdb, data, log - 4 logical disks) but in your case is just for keeping things "tidy"...