Create a share FSW on another server or CIFS

Hi

I create in my lab, 3 serveurs Windows 2012 R2, all servers in a cluster.

I check to create a share for FSW (File Share Witness), what is a best practices ?

1 - Create a share on CIFS?

2- Create a share on another server Windows 2012 R2?

3- Create another cluster for a share?

Do you have a link explains a best practice, because later, i create name cluster?

With a many cluster,  the best way is it better to group all shares ? or split on many server?

Thanks