That solution still integrates with AL Priority. Have you done this setup on the M3? If so I would love to understand where you placed the sensor units in the front.There is, it's not a laser detector. I linked it. It's 4k, not bad if that's your only option to speed with impunity.
If you wanted to save a bit you could just run a good Escort or Valentine detector ($400-$500) and the AL Priority system (~$2K or so) separately. It might not have the slick integration of the Radenso but that is really just a convenience factor and not worth nearly $1500 imo.
Still the issue remains though.. how do we mount the AL Priority system on the M3 without cutting up the front of the car.