Atleast this kind of multi screen setup will be there when someone successfully day trading for years

And when someone is day trading they have to look into the analysis all the time so small screen will be a bit annoying thing for them.
This setup is the typical setup for the day traders. But I think if you're just starting out, you can use your other device as long as they've got a bigger screen like the tablets and laptops will do too.
Analysis for some time in a day and I think you're good at doing that within a few hours. Doing that all the time will make you lose your time for doing other things but at least you get to do that within a few hours