What to consider:
In most cases we recommend the Hybrid Self Hosted plan, but for some organizations, the benefit of an installation that is completely independent from the cloud outweighs the additional costs and limitations.
The Full Self Hosted plan provides that with a fully independent self hosted installation for those that need complete detachment from the cloud. All certificates and traffic will strictly go through your infrastructure, like the Hybrid plan.
This is a streamlined version that also provides a local API and dashboard, which can be locked down to your liking on your own infrastructure and networks, and will replace the cloud API and dashboard for your usage.
Do note that newly released features seen in the cloud version may be delayed or never ported to the Full Self Hosted version, as some require cloud infrastructure that is difficult or impossible to reproduce in other environments.
We have to develop and maintain this version separately from the cloud, which also raises the price, but provides a completely self-contained solution.