SSR supports installation on KVM.

Proxmox is a complete virtualization platform with its own distribution suite.

Inability to install or migrate to Proxmox

Although a version of KVM runs under the hood, there is no official support for Proxmox. We do not QA on it, and we do not have documentation for it.

Please see the following documentation for the various platforms that are supported:

https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/hypervisor-support/