I set up at the 20M line.
Another detail, I also used a table that didn't have plexiglass brass shields.
The radar can interfere with itself it too close to a wall/division.
I had very accurate and consistent readings for 0M, 3M, 6M, 9M, 12M and 15M.
The 3M velocity is the one that resembled a classic chronograph method the most, which had just a tiny drop compared to 0M reading.
But will use 3M reading anyways to protect myself for PF.