For Matrix, I’d recommend https://gitlab.com/famedly/conduit over synapse, with the expectation that all of synapse’s features haven’t yet been added (most notably support for spaces, which may or may not be a dealbreaker).
It’s incredibly easy to set-up and very lightweight. I never self-hosted synapse due to how resource-heavy it is, and constantly had issues with dendrite racking up resources as well.conduit has honestly been the easiest thing I’ve self-hosted.