Dell S4128F-ON Stacking

Hello,

We just purchased two S4128F-ON switches that came preloaded with OS10.4 from our vendor. I am installing these switches to replace two Cisco 2960s switches that currently use for iSCSI traffic. 

These switches arrived with 40G-DAC QSFP cables that I assumed were for stacking these switches, but I'm seeing articles that stacking is not supported on OS10. Is that true?

I'm seeing VLT as another option but won't I still have a looped topology with these two switches connected in a VLT domain and then run a LACP connection up to our provider?

Apologies if I'm having being ignorant with how loops are formed, but I thought that was the advantage to stacking.

Thanks.