Another way you can solve this is to paint up into the bottom of the windshield and place the numbers straight across the front above the air intake. You will have to measure to make sure how high you need to paint into the windscreen and you will lose a bit of vision, but it shouldn't be too much. If you run with the "other" organization they have become very strict that all numbers must be straight across the front.
Its a bit tough to do with the large 8 inch numbers without eating into your vision a bit, but its not that bad. For what its worth, I seem to have noticed a lot of people using 6 inch numbers on the front and tech never seems to stop them or give them a difficult time. I'm sure if I put on a 7.5 inch front number they would take out a ruler and fail me on this rule - but - I have seen a lot of numbers that are WAY smaller than 8 inches and they got trough teck OK.