If I'd choose to read an anthology, I'd do it from start to finish.
Concerning poetry: Yes, this is difficult.. I just got a digital book with 50 poems from an Iranian poet. I don't know much about this kind of poetry, so I'm really curious about this now. But I'd prefer a paper version, of course.
To be honest, I would not switch to landscape mode to read poetry. If these poems can't get displayed on an Eink screen, I'd prefer not to read them on an Eink reader.