The minimal server requirements for Bloxby can be found here.
If you’re looking to install Bloxby on a VPS and you will use our free installation service (offered to customers who purchase either the Professional package or the Enterprise package), we would advise using Digital Ocean. More specifically we recommend setting up a new droplet with Ubuntu 18.04. You can start with either a 512MB droplet or a 1GB droplet and upgrade to a better one when needed (Digital Ocean makes upgrading your VPS very simple).
We do not recommend using a WHM/cPanel server. For more information, please have a look at this article.