It was tricky and even a little risky since the space was really really small. I would have to push a little hard to make the plug inside the grill (I did that to all excepts the middle one).
For the middle one, I drop the light from the front of the engine bay, and make it visible from the grill. Then I used a skinny and flexible hook from the outside of the grill, and finally made it.
My hunch is that the same method of the other 4 lights would work, but I didn’t do that since I didn’t want to risk it.