4G/LTE WWAN card + Adapter

Hey guys, could you please lend a hand? :pray:
By purchasing a WWAN card (Sierra MC7710) and inserting it into a PCIE to USB adapter. Also I insert a SIM card.
Would it be possible to flash OPENWRT on it? Do I need to buy raspberry pi as well?
Does anybody have a link or tutorial on how to flash or whatever a WWAN?
Guys,I appreciate your future assistance. :wink:

no

some kind of host, yes.