I think the area between the upper and lower set of rockets looks rather large and probably contains servo arms to manually depress the launch buttons on those rocket launchers. This would mean standard run of the mill launchers could be attached.
In such a case I would probably have mounted two more on the end and had 6 ready to launch 72mm rockets. If that is the case then I would go for the RShG-2 assault rocket launcher as its 72.5mmrocket would not over load the vehicle, but its thermobaric warhead should make short work of non armoured targets. for light armoured targets or light and medium vehicles the RPG-26 can penetrate 440mm of armour which should deal with most non tank targets. For heavier threats then I would not mount Kornet-EM on an unmanned vehicle... it would be better suited to a Tigr-M with more ready to fire ammo.
Just my opinion of course...