FortiGate firewall can work a load balancer. And quite a good one, btw.
Extremely useful service from Fortinet that allows you to check if a selected model is powerful enough for your tasks: https://docs.fortinet.com/max-value-table
For any model and software version, you can check the number of supported local users (for VPN), the max number of load-balanced servers, etc
00:00 Intro
00:09 Load-balancing feature
01:17 How it works
01:47 Limitations
03:03 Configuration
05:19 Useful workaround
06:01 Outro