There is a novel called Fortunate Wife (which surprisingly so has a webtoon released now in Webnovel) . There’s also a Ployandry tag on Novel-Updates but without a large selection. I’m definitely planning on targeting this idea but I got a few other novel storylines to go through first . ~.~
Harem novels were never really easy to make and most of the ones available are just... well, it’s difficult to write harem novel, regardless if it’s geared towards men or women and despite the huge popularity for it, I don’t know about how large the target audience for the reverse harem trope is. People usually write what they see as popular for the masses. That is the reason we keep finding replicated story concepts with the same repititve tropes .