The formatting in mobi is different than in ePub. However, I think that Sigil should be the best choice. Just load the HTML and finetune there. However, please keep in mind, that when the image does not fit in the screen, it will be placed on the next page. Mirroring is something else. That should not happen.
Is there a chapter change at those pages where you can't turn back? It should work though.
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