I would suggest getting on Lightsail and running a free instance for 30 days. Try setting up CMM and XF on CentOS 7.
Seems to me that you do have $5 extra if you can contemplate between 200/10 and 400/20 as I'm sure the difference is more than $5 between those two packages (more or less). If not, I'm sure it still exceeds $3.50, the lowest cost of Lightsail / Vultr instances (which I've run XF on -- slow to install software [CMM], but 2-3 users won't be a problem with XF). And if the difference is more than $5, just settle on a shared host with cPanel if you're uncomfortable with command-line after 30 days.
If CMM is too hard to grasp after 30 days, you can always get a $5 Lightsail plan with Plesk as it'll give a graphical interface to work with adding domains, databases, making backups, uploading files, etc.