How to clip generators or buildings in general closely into each other

Fairly new to the game, loving it so far! While experimenting with blueprints I came across this blueprint for a very compact 24 fuel generator powerhouse, in this bp I love what they did with the clipping, however I cant seem to replicate it. I know I can just use the bp, but I would like to know how to do this for future projects or if it is even possible by normal/vanilla means. Thanks in advance!
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