I am using the Garmin R10 in an indoor (garage) environment with impact screen, but no projector, and the Titleist ProV1 RCT balls. R10 sits 7ft behind the mat with the legs sitting approximately 1 inch above the surface of the mat.
My issue/concern is that the R10 more frequently does not pickup shots (irons/wedges) when they are struck perfectly, than any other shot.
I'll play a round of golf on the E6 Connect and over the round about 2-3 shots wont register at all, with all of them being a very clean ball strike.