Here’s a pic of the camera on my Jen Too, using the N-FAB bumper mount bar.
I have the LP4’s mounted on the farthest reaches of the bar, which corresponds to the brackets you can see on the bottom corners here.
So if you are going to drill into the stock bumper, you could probably use the camera as a “guide post” for where to drill. Were I to do this I’d have stuck painters tape on the bumper until I got to the periphery of the camera and then moved over slightly.
Jen Tres bumper is a little different but not horrible. I will note, LP4 mounts are not as simple as squadron pros. They do come with a single post but they’re a little portly. I used the 2 edge slots instead of the middle post.
HTH!