The jiggery pokery called Flare Law that goes on beneath your feet below 50' in Normal Law in the A320 Family is there simply to make it behave like a non FBW aeroplane in the flare. Therefore, it matters not whether the FDs are on or off, whether the FPV is on or off or anything else for that matter.
The 'Flare' FMA is nothing to do with this and becomes active only during an Autoland ie AP1/2 engaged and 'Land' annunciated.
Cheers
mcdhu