You need different LUNs (and therefore mountpoints) for Snapinfo, UserDBs and UserLogs and since it's best practice also for the TempDb and the TempLog. A possible structure would be for example:
X: --> driveletter as "root" LUN (per instance as install directory of the SQL instance, also containing the SYSDbs)
X:\<instancename>_UserDB --> mountpoint
X:\<instancename>_UserLOG --> mountpoint
X:\<instancename>_TempDB --> mountpoint
X:\<instancename>_TempLOG --> mountpoint
X:\<instancename>_Snapinfo --> mountpoint
For the next instance you can create the same structure with a new drive letter as "root" LUN.