How to point tablespace in Oracle's pre-built Developer Day VM to another mount point
NFS
I highly recommend you change your design to use a supported file system : NFS.
The database can use its own NFS client driver (Direct NFS) to talk to the NFS Server.  It will use the OS's if it can't use DNFS.
UNDO/TEMP
I'd keep these on the SSD and set AUTO EXTEND to NO.