New solar installation, can these devices be integrated without the cloud? (Hypontech & Dyness)

Hello,
I am currently getting quotes for my first ever PV installation with battery storage, and the installer I'm the most likely going with is proposing the following:

-Hypontech HES-3680 inverter
-10kW Dyness Powerbox G2 Battery

I was wondering if anyone here had any success integrating these two devices into their home assistant offline? I don't want any cloud dependency in case the company goes south, ends support, or decides to enshittify the product in the future.