in the mid nineties, the hospital I used to work for bought a jeep wrangler with a snowplow ( despite the fact that they had a contractor doing snow plowing the hospital, I just think it was so the boss could borrow it to plow his own driveway)
Anyway, I remember seeing the accessory catalog when the Jeep was new, You could buy a bar that screwed on to the front windshield post and was pre drilled for driving lights ( which were also available as an option) the bar came up the windshield pot and across the top of the roof just above the windshield. I think you could put at least for Off road lights up there ( maybe as many as 6 , I dont remember)
It seems to me that if that was still available, a beacon or light bar could also be bolted and wired through it.
That was a long time ago, I dont know if that option is still available.