In a small company there is a server Dell with installed an ESXi 6.7 Free Version.
It is a standalone server without connections to other servers and without other VMWare software.
There are 4 VMs: an old Win Server 2003; a Win Server 2016; a Win 10 Pro PC and an Ubuntu Server 18.04 LTS.
A UPS must be connected to manage the controlled shutdown.
The budget is limited and we are oriented towards APC Smart-UPS 1000/1500 VA.
It must support the Dell server, a PC, a switch and a small NAS Qnap. Obviously only for the time necessary to switch off everything (about 10/15 minutes).
For the management I wanted to propose NUT because Open Source, but I can't find one of its clients for ESXi 6.5, only for the previous versions.
Can I trust installing it or is there any other open source software?
Thanks in advance for any advices.