From https://www.dbs.com.sg/personal/deposits/bank-earn/multiplier there's home loan instalment, insurance and investment. But there are some additional terms:
The first 12 months of your regular premium policy will be recognised for higher interest on your Multiplier Account balance.
Regular premium due will be recognised once the policy is in-force, after the free-look/cancellation period.
Valid for new DBS Invest-Saver purchased after opening your Multiplier Account.
The monthly contribution amount of Invest-Saver plan for Unit Trusts (UT) or Exchange Traded Funds (ETF) will be recognised for the first 12 consecutive contributions per investment fund.
Contribution must be made in cash, not using funds from your CPF or Supplementary Retirement Scheme (SRS) account.
Not something that can be maintained for a long time because of the "first 12 months" rule. As for the home loan, I have not taken such a loan so I'm not entirely sure what the actual terms really mean.