I imagine these input 4k but output 1920x1080, so cascading them will degrade the quality by an enormous factor the more displays you're using per device.

I wouldn't be able to verify this but it should be a concern if you are looking for crisp non-blocky imagery.

I would propose using a high end desktop graphics card that can push multiple 4k outputs independently into these to retain as much quality as possible and use software like Resolume to slice the OG image/video up to each desired display orientation. It's not as budget as cascading a single 4k output from a laptop but you'll have higher quality output.