N-way diff tools besides diffuse?

I'm looking for a GUI diff tool that does n-way diffs. I have a scenario where I need to make edits to upwards of 20 configuration files that have nearly the same content. I'm currently using diffuse and it works much better than 2-way compares 19 times, but has some shortcomings that are hopefully addressed in another package:

• max 16 in the file list
• can only copy/merge to one file on either side of selected file. Would be nice to select a line on the leftmost file, click a button and <zzzzzzzoit!> it's pasted or merged in all the other files.
• ability to just drag all 20 files onto the app at once instead of one at a time

Open source or commercial is fine.

A VSCode extension would be fine to but I didnt find one in my cursory glance