Launching more containers with a Traefik+Odoo+Postgres .yml - postgresql

Question

I'm using a .yml to launch an Odoo instance & its postgresql through a traefik and it works perfectly fine. It assigns the domain and subdomain with a Let's Encrypt certificate, perfect.
My issue now is that I wish to launch more of these but I haven't succeeded in doing so.
I've tried:
Changing the ports: in the odoo section
Removing the ports: section from the odoo section
Editing the ports: in the traefik section
The .yml:
version: "3"
services:
odoo:
image: odoo:12.0
depends_on:
- db
restart: unless-stopped
networks:
- internal
ports:
- "8069:8069"
- "8072:8072"
environment:
- HOST=db
- USER=${ODOO_USER}
- PASSWORD=${ODOO_PASS}
volumes:
- ./odoo/odoo-web-data:/var/lib/odoo
- ./odoo/config:/etc/odoo
- ./odoo/addons:/mnt/extra-addons
- ./odoo/logs:/var/log/odoo
labels:
- 'traefik.http.routers.odoo.rule=Host(`${ODOO_TRAEFIK_URL}`)'
- 'traefik.http.routers.odoo.entrypoints=websecure'
- 'traefik.http.routers.odoo.tls.certresolver=odoo'
- 'traefik.port=8069'
- "traefik.http.routers.http-catchall.rule=hostregexp(`{host:.+}`)"
- "traefik.http.routers.http-catchall.entrypoints=web"
- "traefik.http.routers.http-catchall.middlewares=redirect-to-https#docker"
- "traefik.http.middlewares.redirect-to-https.redirectscheme.scheme=https"
db:
image: postgres:10
restart: unless-stopped
networks:
- internal
environment:
- POSTGRES_DB=postgres
- POSTGRES_USER=${ODOO_USER}
- POSTGRES_PASSWORD=${ODOO_PASS}
- PGDATA=/var/lib/postgresql/data/pgdata
volumes:
- ./pgdata:/var/lib/postgresql/data/pgdata
traefik:
image: traefik:v2.0
networks:
- internal
- web
ports:
# The HTTP port
- "80:80"
- "443:443"
# The Web UI (enabled by --api.insecure=true)
- "8080:8080"
volumes:
- "./traefik/letsencrypt:/letsencrypt"
- "./traefik/traefik.yml:/etc/traefik.yml"
- "/var/run/docker.sock:/var/run/docker.sock"
command:
- "--log.level=DEBUG"
- "--api.insecure=true"
- "--providers.docker"
- "--providers.docker.defaultRule=Host(`{{ trimPrefix `/` .Name }}.${TRAEFIK_DEFAULT_DOMAIN}`)"
- "--entryPoints.web.address=:80"
- "--entryPoints.websecure.address=:443"
- "--certificatesResolvers.odoo.acme.httpchallenge=true"
- "--certificatesresolvers.odoo.acme.httpchallenge.entrypoint=web"
- "--certificatesresolvers.odoo.acme.email=${ACME_EMAIL}"
- "--certificatesresolvers.odoo.acme.storage=/letsencrypt/acme.json"
networks:
internal:
web:
external: true
Assuming I already have a Traefik + Odoo + Postgres already running, how could I go about launching more instances of these together?