Most of the big in-running punters in the UK & IRE use "drones" now, basically controlling them near the racecourse. Years ago it was positional spotters at various points of the track and the use of live mobile phones feeding back info to a HQ.
Here's an article on it
https://www.wired.co.uk/article/horse-racing-drone
The problem is that liqudity has dropped by around 70% from Betfair's Glory days back in the late 2000's.
You could also hire out rooms where apparently the video feed from the track is a lot faster than commercial racing TV which will always be around 4-6 seconds behind the live event depending on the racing channel.
