Hi @Hamish_Muir,
Welcome to Airtable Community! :slightly_smiling_face:
This is not doable directly in Airtable. Each Form submission is a separate Record (row). How will the 2 contacts appear in Airtable? Will each have their own record or both in the same record?
In addition to that, a form is linked to one table, so data goes only to this table.
If you want, you can use another form service like TypeForm or JotForm and import the data you need via Zapier, you can then import the data as you need it.
BR,
Mo