RedundantBGP Route Reflectors cluster-IDs

Consider the following topology:

https://imgur.com/a/3bN9fpC

Would it make more sense to use the same or different cluster-IDs? My understanding as of right now is different cluster IDs.

Current config of RR1:

RR1#show run | s bgp router bgp 2 bgp log-neighbor-changes neighbor 4.4.4.4 remote-as 2 neighbor 4.4.4.4 update-source Loopback0 neighbor 4.4.4.4 route-reflector-client neighbor 5.5.5.5 remote-as 2 neighbor 5.5.5.5 update-source Loopback0 neighbor 5.5.5.5 route-reflector-client neighbor 6.6.6.6 remote-as 2 neighbor 6.6.6.6 update-source Loopback0 neighbor 6.6.6.6 route-reflector-client neighbor 7.7.7.7 remote-as 2 neighbor 7.7.7.7 update-source Loopback0 neighbor 7.7.7.7 route-reflector-client neighbor 12.12.12.12 remote-as 2 neighbor 12.12.12.12 update-source Loopback0 

Each client has 1 peering to each RR.