Which infrastructure configuration to choose?

Question

PHP

Hello!
I am preparing to launch a project, the architecture of which is standard for modern IT - a mobile application, a web server (language - php). Plus, the presence of downloadable static content (pictures, video, audio, etc.).

Thinking about the configuration begins. I think the most correct way would be to make a separate web server for processing php + mysql (with HHVM technology) and a server for storing static data. Plus, you need the ability to scale both servers.

The question is which hosting company to choose, which technology to choose.
I started reading about jelastic, I heard that it is an interesting thing, but not in the case of reg.ru. Moreover, I can’t figure out what its capabilities are and which of my tasks jelastic can solve.

Maybe just take two vps - on one HHVM with mysql and memcached, on the other hhvm and implement scripts for uploading files there?

Headache, please help.

Thanks in advance for your understanding and your time.