With two LI receives there is no issue of coverage. I have had it installed since 1/10. Lasered many times with no issues.

Yes, you would think the top spot is to far back. But the issue would be getting hit from the side. We moved receivers in a couple of inches. As you can see from my picture they are easily seen from the side.

The other issue with below the bumper is that the underside of the bumper has a slight upward tilt. So if you use double sided tape then the receivers point up more than they should. They receiver should be level with the road. So if you mounted it under the bumper you would have to do a lot of work to get them level.

M