The garage door rodent guard helps block some of the gap but not all of it. It makes the consumer more aware of where the problem lies so they can put more thought into the solution. It seemed like a good idea at the time.
The metal guard is terrific BUT the tape is a pain. Could use an extra piece if one doesn't lay right. One of the wipes was all dried out and couldn't clean the rubber door gasket. Fortunately, in this time of pandemic, I have plenty of alcohol wipes. The install looks very good on one side , the other not so good.
Unfortunately, this product is not "one size fits all." I think it's probably a decent product but check your dimensions against the dimensions of the product. I understood it as being malleable in order to fit my garage opening but it was difficult to adjust even with plier.