I run a couple of Talos clusters on Proxmox at home; I haven't templated them yet as they're pretty static clusters, but I suppose you could use a Proxmox Snippet with the config in and point new Talos nodes at it when they boot.

I've also been using a Terraform module for Proxmox at work to deploy stuff, but there's only two, both community modules and neither is gold/platinum tier, good enough for homelab though I'd say.