None of the reasons why many traditional databases have multi-tenancy support was ever relevant for redis.
And in a world that increasingly moves to containerization you should really look into adding automation to your admin workflow (e.g. ansible).
'port' and 'startup script' should become 'service' and 'template' in your mind.
Now you have to deal with multiple ports, startup scripts etc etc
That's just what happens when you live with production systems. Not every service in the world gives you a dev/staging/production server with "curl github.com/my-bespoke-database/install-and-run.sh"
The last place I worked had 60 physical mysql servers. We had to deal with ports and servers and startup scripts quite a bit.
