Are you using 'two' just to hold backups?
Or you can switch to point to 'two' and continue serving the services when 'one' is down?
I have a setup with 4 x Pi5. And any of them holds the same. They replicate from 'current primary'. They are also in 4 diff locations (lets say my 4 homes 
)
And I can switch from one to another when primary is down.