Microsoft Word ties footnote anchors in the main text and footnote numbers at the start of footnotes to the same style. Consequently, it’s difficult to get full-height footnote numbers followed by a period (cf. Chicago Manual of Style, SBL Handbook of style).
That being said, the process discussed at Word MVPs does still seem to work with Word 2016. If it’s desirable to have the note number followed by a period and a space rather a tab character, the following modified Visual Basic macro code should do the trick:
.Paragraphs(1).Range.Characters(2) = ""
.InsertAfter "." & Space(1)
Unfortunately, it doesn’t immediately seem feasible to intercept Zotero’s insert citation macro, and that macro doesn’t appear to be tied to this particular function in Word. So, an update to what Word runs for the InsertFootnote command won’t be triggered by Zotero’s InsertCitation macro. If anyone has suggestions about how to do so, however, those are certainly welcome.