Hi,
You can install Proxmox on the SSD and, given that it has 1TB of storage, you can install VMs on the SSD as well. So you could, for example, use the NVME for VMs that need the data throughput and the SSD for VMs that need more storage.
So yes, installing Proxmox on the SSD makes sense (but really the answer also depends on your usecases and the NVME/SSD type).