On-premises SQL to Azure SQL MI Migration

We have a requirement to migrate around 800 GB of data from on-premises SQL Server (2012 and 2017) spread across multiple databases to Azure SQL MI. We have run the DMA on the source data and have got some issues (datatype not supported any more, coding style changes etc.). We are planning to use DMS to perform the data migration My questions are: 1. Which stage I should perform the remediation, in the source itself before the migration or in the target Azure SQL MI 2. Which option is preferred for the data migration