Hmm...I'm just a hobby SW user but I cannot see a way to (1-step) mirror that topside feature to the opposing underside like that. Mostly because I can't envision a plane that would satisfy how mirroring works. So I'm going to chock this one up to A) my inexperience B) 'trick question'
I do have a solution but its not mirroring, its a circular pattern. Here are the screen grabs FWIW.
- make an axis between 2 planes
- invoke circular pattern of the desired feature using this axis
- specify 4 pattern instances & delete the offending 2
- you are left with a single instance something like your desired end result
Hope this helps. Make sure & tell me what the answer is so I don't die without ever knowing.
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