A fierce sabretooth tiger head guarding a server rack with intense expression and glowing blue eyes. (2)
CyberTooth IT
Ferocious Security.
Zero Compromise.

Why CybreTooth IT is the Worst! (not really)

THE Package

SentinelOne Complete
Guardz
CyberGuard 360
Keeper Security
SuperOps RMM
Duo 2FA
SpamTitan
ArcTitan
Veeam Backup
AutoElevate

Options Based on Customer's Need

Firewall Based on Complexity Requirements
Ubiquiti
UTM
OpnSense
UTM
In the majority of cases, the Ubiquiti will be the UTM of choice. Most small businesses will not have a complex enough Internet connection with self hosted, customer facing sites with the need for a reverse proxy. For those with that need, the OpnSense UTM will be used instead.
Server High Availability Based on Need and Server Budget
ProxMox High Availability
HyperV 
High Availability
Having a high availability cluster is definitely a nice-to-have feature, however, that comes at a cost. There are different ways to ho high availability and also ways to do pseudo-high availability (Replication - not quite HA but close).