Currently using SLES 12 SP3 with HA & KVM

I have setup a DRBD in primary/primary mode for the system. However it seem only 2 hosts can use the DRBD device.
Reading the linbit docs, they have a newer managment for DRBD called 'linstor' to allow multi-node cluster to access the DRBD device.
The 'linstor' apps are not in the SLES 12 reporitory.
If i try 'zypper install linstor-client', it come back as;
'linstor-client' not found in package names. Trying capabilities.
No provider of 'linstor-client' found.
Same for 'linstor-server'

Does anybody have experience with 'linstor' to manage DRBD to allow a multi-node cluster to access the DRBD device?

Any comments or suggestion would be appreciated.