With any SIRSTEVEHQ Cloud package, you can host as many websites as you like. You're in control of how many websites are assigned to the server and how resources are allocated to those sites.
How can I monitor my server resources usage?
You can check that your site(s) are getting the resources they need.
Head to SIRSTEVEHQ CP > Options / Manage
From here you'll see your server usage including SSD Disk Space, CPU and RAM.