You will have to be creative with the mounting system. I would think that side by side would be easier but my preference would be one light over the other.
The wiring is gonna be easy but if you plan to have two low beams and two high beams I would suggest to install two relays with a new fused power wire from the battery to feed the headlights. And use the original headlight power wires to activate the relays. This will keep all that power from having to go through the headlight switch.
The wiring is gonna be easy but if you plan to have two low beams and two high beams I would suggest to install two relays with a new fused power wire from the battery to feed the headlights. And use the original headlight power wires to activate the relays. This will keep all that power from having to go through the headlight switch.