No amount of armour plate you can realistically apply can stop a FPV with a shaped charge warhead. You need other means of dealing with converted commercial drones.
The armoured variant will be primarily aimed at stopping small arms rounds and shrapnel from artillery and grenades. I think they will be most useful in urban combat, so shouldn’t be exposed to drones much.
For open field operations, I think a quad limbed robot mount paired with the armoured exo-suit would be an interesting developmental evolution of traditional heavy cavalry. These will be able to rapidly cross open, mined fields and be far less susceptible to traditional ATGM, artillery, RPG and grenade attacks that have been so effective at stopping armoured charges in Ukraine, while being effectively immune to conventional infantry small arms fires. Their armour won’t be able to stand up to FPVs, but the speed and distribution of forces should massively mitigate the effectiveness of FPV attacks, especially against traditional FPV drones that rely on human pilots so are limited in peak deployable numbers.
So, you can have massed armoured calvary delivering armoured exo-suit wearing infantry into enemy trenches at similar speeds to a traditional armoured charge, only ATGMs, FPVs and the like will only be able to take out single riders with each shot, so the vast majority of troops should be able to reach the enemy trenches. Once in the trenches, they can dismount and be functionally immune to enemy small arms and be able to quickly clear the trenches for minimal losses.