Every deposit rule comes down to one choice: a flat amount, or a percentage of the price. Picking the right one for each product makes the difference between a deposit that feels fair and one that feels arbitrary.
A fixed amount works well when the booking or reservation itself has a set cost regardless of the final bill. A percentage scales naturally across a catalog with a wide price range, so a $50 item and a $5,000 item both ask for a proportionate commitment.
Set a sensible default globally, then override the type on any product or category where it doesn’t fit.