Getting data merge to move to the second record on one page

I have a simple design which is A5 landscape so I can get 2 up on an A4 sheet.

I want to personalise each design and have a data file with Forename and Surname.

If I choose "multiple records" in the mail merge box I get all the records merged but with the same name on both designs on the page, so the system only steps onto the next record when a new page is created.

Is there a way to get the data file to index on to the next record on the same page? This seems so simple I feel I must be missing something.