I found this in the help pages.
https://www.wikitree.com/wiki/Help:Editing_Tips#Tables
This page has a table that you can see in action:
https://www.wikitree.com/wiki/Space:African_American_Medal_of_Honor_Recipients
My own recommendation would be to create a spreadsheet on my computer to conform to how I want it to look. Then I would use my handy-dandy clipping tool and convert my spreadsheet from my computer into an image and upload that to the profile(s). Tables are great options on free spaces that are subject to editing, but as a display, in my opinion, an image is preferable and easier.