Dell Vostro 5510, SSD upgrade

Hi,

I want to buy Dell Vostro 5510 and I want to upgrade SSD with which laptop comes(512GB). In the section Intel Optane Memory H20 with Solid-State Storage(optional) of setup and specifications manual, it says capacity is up to 512GB but in the storage section other options are listed(up to 1 or 2TB)? What are my options then? And also, does SSD come preinstalled on M.2 2230 or M.2 2280 slot and is it possible to have one SSD on each of those 2 slots?

Thank you,

Andi