3 (bottom left) is the most interesting one, but it’s the most work and the top ones are hard to water. But like, those are your future problems, my vote goes to 3.

Top left for ease of maintenance. But if you do bottom right, thst will grow the largest pothos since they’re allowed to climb like they do in the wild.

1, but it’s difficult to water :/

Pothos but with the pots at the bottom and wrap/grow them around a wooden stake.

The style is often called “totem” pothos and you can make them as tall as you like.

Top left, but get some long planters. I did this on a windowsill and it’s just a curtain of pothos. It took over a year to really fill in but now it’s like a waterfall of green and looks really cool.

N2, not sure where the pot is? Reason for picking this is that it’s a single plant. You still have space for your stuff on the bottom shelf, and it seems more open to whatever variation in growth the plant actually takes.

The others with multiple pots either take too much space from the shelf, or even worse, they connect multiple shelves. These are vines, potus is easier but ivy will surely get tangled with one another and the day you need to move one plant out of the way for whatever reason, you risk pulling all others away with it and make a mess (possibly also harm the plant). Similar scenario if you are ever clumsy reaching for a book or something on the shelves.

I can suggest other potted plants for the shelves, I’ve seen ribbon plant do very well and you can also try potus, but I’d recommend a single creeper for the empty wall space.