Potentially nothing on site is required to host Helios if you’d prefer to not host it yourself and have us host it for you.
But if you’ve already got infrastructure, great. Helios is designed for flexibility. It can be deployed in large scale data centres with distributed environments right down to the small scale off the shelf commodity hardware of a single machine.
Experienced system administrators familiar with standard GNU/Linux environments will have no difficulty at all deploying Helios.