As described here, MacOS has a nasty habbit of resuming sleep or booting up with external monitors swapped in between when using multiple identical monitors.
Using DisplayPlacer and help from the community, we can configure a BetterTouchTool keyboard shortcut (or other shortcuts) to swap them in their proper place when they bootup in the incorrect order.
- Install DisplayPlacer by running this in your terminal (requires Homebrew)