Another approach is to grab a Top 5 of anything.
e.g. Best Bets, Neurals any settings, Ratings, Pre-post market, Place Ranking, Av Prz Money ect.
They all have a similar SR.

Look at the UniTAB market where the 2 columns of TAB prices are shown.

Target those of our Top 5 that show that they have blown out in price.

Make Back bets on Betfair for some big overs.

12+ runners.

The more obscure the Rating application ,the greater the prices tend to be.
e.g. Sectional times & Days last Start.

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Cheers.