If you ever need to do a Forced Update, click on this link to acquire your code versus having to contact JK.
https://mirofromdiro.github.io/JK-firmware-code/
The ground will take all the heat you can give it and ask for more.
I'd DIY a radiant heated patio if that is what you're after. Insulation is a must though.
How about applying some "Project Farm" advanced weathering juice and retest after a couple of weeks.
YouTube Project Farm if you're not familiar with him.
I agree this would make the wiring the simplest, but being able to shut off one breaker and isolate one of the inverters quickly could have its benefits.