Also wrt this - the server.toml config file won’t do anything at all with the client. It’s meant for configuring the server only.
See: Using a self hosted server | Atuin Docs
I’m not sure how macslow.org is setup, but it’s probably easier to setup atuin.macslow.org and run Atuin there. Otherwise you could put it at macslow.org/atuin, and set path = 'atuin' in your server.toml
regarding that: Can I reverse-proxy the server into a sub-location?