Sorry it took me a while to get back to you.
It would help if you let me know which SRA.
Most storage side replication requires you to fail over a whole LUN at a time if this is the case and you leave them all on one LUN you will need to fail over all machines at the same time.
You could split them onto seperate LUNS and then you are able to failover one and leave the others, whether you want to do this depends on whether you are likely to ever want to do a partial failover or partial test, or if you don't care and are happy for it to all go over at once.
If you use vSphere replication it does not use the SRA and instead uses Host based replication, the advantage is you replicate each machine individually.
So you would need to kill the storage replication and present the datastore to vmware on the target side, then let vSphere replicate it. I don't recommend it if you already have storage replication set up.
There negative thing is there are a number of limitations http://anthbro.wordpress.com/2011/12/21/vsphere-replicationadvantages-disadvantages-and-limitations/
I would recommend to stick with the storage side replication if you already have it, and design / rework your storage as you require.
Let me know if you have any more questions.
Thanks