Anubias placement in tank

It'll grow wherever you put it really, so long as the roots aren't submerged otherwise they'd rot.

I've found it best to tie the stem to a suction cup and stick onto the side of the tank, my anubias really took off when I did this, likely due to being closer to the lighting; and again letting the roots float freely

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My Anubias in areas of my 180g are from the substrate all the way up to just breaking the surface depending on how much water I let evaporate. Anything breaking the surface that was once submersed will has turned brown and died off.

Anubias plants such as nana, barteri, etc... do best when attached to something like driftwood, rocks, etc... and should never have their rhizome covered because they can and will start to die off. Lighting only effects how much new growth the plant does, such as low light will mean slow growth, high light will increase the rate growth; People that say they need to be shaded aren't correct in their theory, anubias can flourish under direct lighting, it's how close to the lighting itself that can cause light burn especially under really hot lighting such as metal halide.