Same here, I’ve got surname.com registered and use static DHCP with entries on Cloudflare for router.surname.com and fileserver.surname.com and grafana.surname.com etc. all with valid certs via letsencrypt.

I’ve recently set up hard coded local entries for router.domain and nas.domain but not got around to adding printer.domain yet. In theory it is quite possible to define static DHCP entries for a bunch of different containers with bridged network interfaces then add entries for individual services like filemanager.domain and mediastreamer.domain and downloader.domain and cctv.domain etc.