Didn't anyone advise him you can't run them in even numbers (2,4,6,8) as they cancel each other out. They must be in odd numbers (3,5,7,9) to prevent this.
And if you must run 2 (because 3rd unit in for warranty work), then they should be in meat bags for maximum shielding against each other - or you must have 1 in the vehicle and the other must be mounted on the outside of the windshield, but out of the way from the wipers when in use. Some say if actually mounted on the wiper blade with the wiper in use, it makes it too hard for the LEO to spot. And they say it's also more effective because it will enhance the scanning ability from the back & forth movement -

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