As title says, is it possible to have Horizon cloud pod with 2 sites each with one pod and that they protect each other ?
SiteA can accommodate all of it's users and has reserve capacity for 20% of siteB users and vice versa. So normally users connect to their original/primary site, but in case of disaster event some users could be failed over to other site.
Desktops are linked clones with all important data stored outside of desktops itself.
Should this work as imagined ?
Check out the newly released multi site reference architecture guide for the many options.
From the description it sounds like you are looking for Active/Passive with home sites defined for the users.
Hope this helps!