Installing On ext ssd in mac 2017

I need a help to install zorin on ext ssd in mac 2017 macbook. I am confused which option to choose, please help

You will want to choose EXT4 Journaling file system for that selection.
Below that, you can set Primary Partition. That is a bit more flexible as an option. You really can choose either Logical or Primary - I recommend primary.

For mount point, set that as simply

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