I'm trying to get back into self hosting. I had previously used Unraid and it worked well to run VMs where needed and Docker containers whenever possible. This biggest benefit is that there is an easy way to give each container it's own IP so you don't have to worry about port conflicts. Nobody else does this for Docker as far as I can tell and after trying multiple "guides", none of them work unless you're using some ancient and very specific hardware and software situation. I give up. I'm going back to Unraid that just works. No more Docker compose errors because it's Ubuntu host is using some port requiring me to disable key features.
Proxmox doesn't really do Docker containers well (yet, or maybe will at all). It does do LXC (both of those are OCI containers at heart), but that's not as well supported or as versatile as Docker/Podman. I'm more than sure Unraid is great at what it does, but it's not a VMWare killing virtualization solution in production like Proxmox is with its great support for redundancy, versatility and relative ease of use if you come from a Linux background.
OTOH Proxmox is not Portainer. It's for VMs and VM-like containers, at least for now. Supposedly kernel 6.something helps a lot with OverlayFS support in nested containers, but I can't go to bleeding edge kernels in production to test that.
Still, are you sure you need an IP per container?
More than fair. I do have a Proxmoxy solution if you want it, which is to run it as an LXC, but it does seem that something more container-oriented may be your best bet rather than sticking with proxmox if you don't need the extra stuff it offers.