If you're not strictly melee class (and if you want a bow, you're probably not), weapons with longer range might be better than a yo-yo, when fighting greater mimics.
The row of platforms can work too, but also, if you have higher tier wings, they can be a huge help with fighting mimics.
They can be easily created with keys, so you can fight them wherever you want, so you can build something like an arena, or just a larger, relatively flat area, - most likely on the surface - with campfires, heart lanterns, etc., and you could get some potions and food too, for some more buffs.