FreeNAS High-Availability (HA)

Hi all,

I am aware that High-Availability (HA) is only available in TrueNAS but I was wondering:
1: Can TrueNAS be bough/downloaded without buying the hardware?
2: Using FreeNAS, is it possible/realistic to create a FreeNAS HA using CARP?
How would you sync the data between the 2 FreeNAS server?

I would like to set up a cloud hosting experiment with XCP-ng using FreeNAS as VM storage via iSCSI