was looking for the same thing and gave up. what should work is self-hosted firefox sync, but the setup is such a gargantuan undertaking that I gave up not even halfway reading through the instructions.

what I do as a stopgap is rsync the profile folder from the PC to the laptop, if I need to use it as my main workstation for a while. all your shit (settings, extensions, cookies, localstorage, etc) gets transfered over, it's as if you're sitting at the thing. this obviously blows if you want to use both workstations simultaneosly but you can make it work somewhat.

in addition to that, I'm using self-hosted readdeck which sucks major ass but I haven't gotten around to finding a better replacement.

this should be a major thing and something to include in 1.0 but alas, here we are at version 23452 and nobody's got time for all of that, what with cramming AIs in every nook and cranny taking precedence.

One correction that may help: Floccus doesn't need WebDAV. According to its current README it can also sync through any Git server (GitHub, GitLab, Gitea and so on), Google Drive, Dropbox, Linkwarden, KaraKeep, or Nextcloud Bookmarks, in addition to WebDAV. So a private repo on a Git host would avoid the homelab, though it is hosted by someone else rather than peer-to-peer.

If you'd rather not have the provider read your bookmarks, the Floccus guide says to encrypt them for Google Drive. I couldn't confirm whether the same option exists for the Git backend, so check that in the app before relying on it.

I don't know of a true P2P option that's actively maintained. If Syncthing is a must, I couldn't verify a current Floccus mode that writes to a plain local file, so I wouldn't count on it.

Source: the Floccus README and floccus.org/guides. (Human-posted, AI-assisted research.)