Charging two Apex 300's via Generator + A1 Hub

Hi,

I have two Apex 300’s with each one B300K in parallel via the Hub A1. No solar panels as of now, simply a cleaner/quieter option to the generator during outages for the house.

I also have a Firman 10000/8000watt gas generator (specs attached) which we’ve been using to feed the house via a manual transfer switch (30A) during outages.

Until I replace the generator with an Inverter Generator later in the year, can I safely recharge the Bluetti setup using the 120v plugged into our current Firman generator?

If “yes”, is it best to use the A1 power cord (will it spread the charge to the other Apex & batteries or would I need to charge the Apex 300’s/B300K’s individually?

And finally, if “Yes” would I need to make any adjustments in the app?

Thanks in advance.