This is how the default AutoTile will fill the spaces as per the number of windows.

Version 2.1.1
Improvements:
Desk Launcher: (Iconify, OverView, and Tile)
- Window focus
- Window on top
- Compatible with Fvwm3 v.1.1.1
Restart:
- After Restart, last window focus
Expose List (window list):
- Selected window focus
Other Changes
- Mini icons and various minor fixes
New version with significant improvements: 2.7.0
https://www.box-look.org/p/2095462