So you want a system that works betting a min of $5 using a max of $30 for the day.

This is currently showing a profit.

RULES
<= 10 runners
Price 4.70-6.00
60 sec

Set Bot to select the 1st horse in that price range that it comes to.
e.g. 4.90 over 6.00

1 horse per race.

It could end up being the 1st, 2nd, or 3rd fav

Bet 5.00
Max wins 1
Max losers 6

Level stakes.

Give it a dry run first.
To see if your Bot can do it.
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If using BF manager.
Try this chasing the shortener method.
Target the 1st-3rd Favs
120sec start recording price.
Place bet at 1 sec
<=10 runners.

Max profit 5 x initial bet.

Once target reached , re-download & go again. (Optional)

You want it to bet any or all of them if any shorten by 20%
Give it a dry run first to see if your Bot will do this.
You may have to adjust the shortening percentage to say 15% if not making any bets.

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Cheers.