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They stay together pretty well, but it's not perfect. They have internal limit switches so when one stops the other stops about 1 sec later. I think you'd be fine with 4 actuators with this application.
Flat Pack Bookshelf (CNC Router)
Laser Cutter Rebuild
6 Flask Coffee Cold Brewer
Arduino LCD Game
From Crate to Cut | Installing a Laser Cutter.
Lunar Phase Clock