Laying a one horse around 30-1

Could somebody tell me if theirs a trigger that will lay one horse per race at 30-1 or close to these odds?

One minute before the off

you can make one. starting with once per market as a setting.

do you basically want to lay any horse closest to 31?

Yes i do or whatever odds i choose.

hi
set the trigger to.
first matching selection.

mcbee