Kinda. I use managed Nextcloud by Hetzner (StorageShare) for ~20 people with their smallest instance (1TB, 4.50 EUR/month) and connected it with a Collabora hosted on the smallest Hetzner VPS (this could use more cores).
If you wanna self-host completly look at https://github.com/nextcloud/all-in-one . I have this running on my NAS for other stuff, but it just works out of the box.
Edit: and it scales. Orgs with a lot more people use it for 10k users or more. And it doesn't need a 100 EUR/month setup, from what I experienced.
Yeah I tested it out with the hetzner app on their smallest dedicated server and it ran fine.
Is storage share the managed service?