A family of Microsoft word processing software products for creating web, email, and print documents.
Use a Table.
See Paul's second question and the responses in https://answers.microsoft.com/en-us/msoffice/forum/all/help-with-allowing-tab-over-to-a-fillable-text/182211d9-a3f6-45a9-86b8-bfc965e8abe0.
A table can be invisible but still hold positions. You want to format the cell / column width to fixed and not allow wrapping.
References that may help:
For most purposes, you will be ahead of the game in form development if you use Content Controls rather than legacy form fields. The two should not be mixed in the same template, though.