Top Rank,when it comes to filters, many people have many ideas, I think it is a personal thing really , you know, what works for you. But some I think are commonsense are:
Raced within 21 days, (OR 1st up if racing up to 1200m)
otherwise restrict betting to 1400m-1950m.

50% place s/r

Last run on METRO track (if racing on Metro track today)

Racing within 3.5kg's of set weight last run (ignore all allowances)
Raced within 3.5 L of winner last run.

No bet if ridden by 3kg. claimer, jumps, amatuer races, Ladies races, aopprentice races.

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Some others, will not bet on 2yo, though the distance cuts out a lot of these anyway.

Some will only bet if the horse ran within 100m of todays race last run.

Some will only bet if the horse has a win in its exposed form i.e. last 4 runs.

The then becomes endless, and its a matter of opinion.

But if you just want a quick fire method try, Top Rated, Pre-post Fav, last start winner.

With the top rater horse in the betting. You sy they have a strike of 27%. How many bets/winners were there.

Benny