IIRC, several years back, a German company had invented a way to track the football down to less than an inch.
But it involved a buried grid under the turf and a small gizmo inside the football.
The NFL turned it down as too expensive...............
An electrical 1” mesh (for water drainage) covering the entire field would be expensive. Maybe on both sidelines (and one strip down the middle) to which the ball’s sensor could communicate.
This raises the question of sensor placement on the ball, which may not have crossed the line to gain while parts of the ball that DID cross the line might not be recognized. It seems 2 sensors front & back, plus 4 around the perimeter quadrants still wouldn’t guarantee