I tend to use /opt/[service]/, like for example /opt/forgejo/. It's outside of any user's Homedir and it seems to fit into what the FHS 3.0 (Filesystem Hierarchy Standard) defines.

My docker mounts just point to the folder they live in.

I’d rather have the data stored next to the config so it’s easy to find and manage.

So a folder would be services and have a compose file, config folder, and a data folder with subdirectories per service I run. Any custom dockerfiles get a folder with their build scripts.

Bind mounts aren't specific to Docker. You're asking specifically about bind mounts as used by Docker?

I always use /docker, but I recognize that's probably not the most "correct" place.

along with the compose.yaml file, unless I need it in a different drive for any reason

/srv/[stack name]/volumes/[binds]

I just like so much /srv is the best folder

/opt/docker/[service]

/docker/compose/ for compose and env files

/docker/data/ for data to be retained

I let the docker overlay handle all the volatile data.

I use the same naming convention as you for stacks, but since I'm running a docker swarm I have to mount the NFS in the exact same way on all my nodes, which are just 3 R-Pi 4s. It's a little janky in that if the NFS goes offline all my services go along with it. Traefik works really well with a swarm, especially when you have it set to auto pick up any services and proxy them.

I mount them directly from the NAS inside docker volumes.

if there are any configuration/local data files that need to be persistent, those are usually kept in ~/project/{container}. the compose file is kept at the root project directory.

home user is a daemon user created specifically for running docker containers that does not have root privileges.

I run a swarm and the NAS~esque machine has its exportfs entries under /export so all my docker persistence data goes into /export/docks///

If you using bind mounts - you are using dockers in wrong way. Use named volumes.

Xdg. Its the only attempted standard for where to put things. Persistent data in ~/.config/docker/service. Others in similar directories under ~/.local/share, ~/.cache, etx.

I didn't think much of what the "correct" location would be. But i have a general kinda everything share at /var/share/[music,books,video,user folders,repo]. And then any caching or config data sits in that dockers home folder under /etc/docker/[jellyfin,immich,kavita,etc] together with its docker-compose file. All docker services run under the group user so they all have access to the share.