I'm dreaming of (remotely) self-hosting Mastodon and kbin, what are me best options?

Hey All,
I'd like to self-host a Mastodon and kbin instance, but without the hassle of the actual hardware management nor the uptime. I've heard of #yunohost but wonder if there are other alternatives?
Can I buy my own domain name and use it for 2 services (like Mastodon and kbin?
Many thanks!