Can confirm. Haven only allows the relay owner's notes for the outbox relay, and only notes tagging or sent to the relay owner for the inbox/chat relays.
I don't think this is possible. I think Haven only allows one user? nostr:nprofile1qqsw9n8heusyq0el9f99tveg7r0rhcu9tznatuekxt764m78ymqu36cpz4mhxue69uhkvun9deejuat50phjummwv5hsz8rhwden5te0wfjkccte9e3xjarrda5kuurpwf4jucm0d5hsz9thwden5te0wfjkccte9e6hg7r09ehkuef0avzrjf?
Discussion
And yeah, same goes for the Blossom server.