The orchestration component in ASR is consumed as a service. On-premises components depend on required infrastructure.
At least one SCVMM is required, however two SCVMM servers (one for each site) is recommended. You will have to install ASR provider on the SCVMM server(s). Internet connectivity is required from the SCVMM server.
Microsoft, Azure Site Recovery/Current, Hyper-V to Hyper-V w/ VMM