Can Atatus be run on on-premise (on own servers)?

Atatus is primarily a SaaS offering.

For ENTERPRISE plan, we could setup your account on a dedicated cluster at our end or on your servers, depending on your needs. If we set it up in our end, then no other customer will be hosted on this particular cluster, and your cluster will be optimized for your specific needs. If we set it up in your servers, then we need access to do all the setup and basic validation before we hand over the control of these servers back to you.