shared application file system clarification

good day

good day

shared application file system has of EBS R12 has four major tops. 

Application Stack - APPL_TOP , COMMON_TOP

Tech Stack - ORAC (iAS/oracle home)

Instance top - INST_TOP

I am asking you, shall I keep the ORA_TOP , INST_TOP in my local disk.

And APPL_TOP and COMMON_TOP in shared NFS File system? 

let me use tech_st in local_disk of apps nodes.

layout give bellow

Apps node1:
=============
/u01/localdisk/inst_top -- node 1 local disk 
/u02/acfs_shared/appl_st/ -- this is shared nfs for node1&node2 
/u01/localdisk/tech_st/ -- node 1 local disk