Yes, they support Elixir (including clustered apps) and it's very easy. I wrote a tutorial and did a 6 minute screencast on that a while back: https://alchemist.camp/articles/elixir-releases-deployment-r...

I generally use a VPS, but Render is a top-notch host if you want something managed. In many ways, I think it's like Heroku was before Salesforce bought them.