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This one does exactly what I need - Tiling Assistant
Thank you for pointing me in the extensions direction - I would not have thought of that otherwise.
I'll try ^ that one too.
NotThamesWater
Maybe gTile extension: https://extensions.gnome.org/extension/28/gtile/
Only skimmed the readme, but it looks like you can specify grid size (e.g. 3x1) and then move windows accordingly.