I haven’t checked into TelHosting during the last weeks, so I don’t know exactly when this feature was added, but the “TelHosting Release Update 60 Hotfix 1 (build 5084)” now allows to hide subfolders /-domains from its parentfolder /-domain, additionally you may apply privacy rules onto the link to the subfolder /-domain.

Unfortunately privacy rules are not yet available for the content of subfolders /-domains yet. However I have heard that this feature should be available for the Summer.