Using corner components (for ink traps) without removing overlaps

I am still a beginner using glyphs and I am wondering if there is a way to use corner components, in my case to create ink traps, without having to remove the overlaps first?
I seen this article here mentioning extra nodes: Glyphs 3: Make Things You Love | Glyphs
Because I have just started using glyphs and still only have the mini version I am wondering if this is a feature that only Glyphs 3 offers. Any advise on how to work around this is very welcome.

Yes. This is only available in the full version.

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