Libre Cloud’s head office is a unit on an industrial estate: 83 James Carter Rd, maps.app.goo.gl/QcUXg5cjUG7pnquAA

They probably colocate at data centres.

Personally, I’m on Hetzner’s Storage Share (Nextcloud but without Collabora), and I’d prefer to trust my data to them: www.hetzner.com/storage/storage-share/

Regardless of your choice, I definitely agree that nextcloud rocks.