I (always) agree with Uli, but ESXi is a friendly shark:
We started using it back at version 4, some years ago.
2 sites, both hosting ESXi. Both with static public IP's, hardware firewalls that support SSL VPN connections to the LANs, no teamviewer necessary.
First system is new Dell server, running 5 VM's. 3 Windows servers, 2 Windows workstations.
Second site's system is Dell precision 5810 purchased on eBay for about $400. Presently running v7 U3, may not run the next version of ESXi.
Mirror VM's of first, for testing prior to production and backup. Plus, it hosts surveillance camera software and a Web server running on Debian. Multiple NIC's/IP's for security.
Although you can run ESXi for free, you can't (or couldn't used to be) run utility software such as Veeam backup. We purchased ESXi when it was on sale, unlimited single processor systems.
If WS runs on Windows, it is subject to restarting at the whims of MS updates. I run it on a Debian based Linux system, fairly new Dell Precision 5820. Runs fine.
For performance, lots of RAM and SSD's. Backups to disconnected and off-site storage. We use TrueNAS for local, remains disconnected after each backup.
