RecoverPoint 4 iSCSI and vRPA Questions

Hello fellows,

I hope someone can help-me, i have a doubt about a layout involving 3 VNX Storages, vRPA and iSCSI, the layout is as follows:

01 Site (principal) with 02 VNX, 01 VNX5400 and one VNX5300

01 Site (DR) with 01 VNX5400

The client has RecoverPoint/EX but does not have RPA, only vRPA

The production storage will be the VNX5400 located on principal site, and will be two replications, one replication will take place between principal site VNX5400 and principal site VNX5300, the second will be between principal site VNX5400 and DR site VNX5400 (using IP WAN).

In this scenario i have the following doubts, replication between principal site VNX5400 and principal site VNX5300 can be done using FC connections dos storages ? Or only iSCSI connections ? Take the fact that only vRPA are available.

The second question is, we gonna need three site configuration inside RecoverPoint for this layout ?

Any help will be of great assistance.