Growatt SPF 5000 ES parallel connection

I have 6x 550W solar panels and 2x inverters. 1x Rosen 48V 100Ah battery. I'm confused at PV connection part in the manual.
1. Is it ok to make a parallel connection on PV side of inverter? (single string)
2. If not, is 3x 550W enough for 1 inverter if I make 2 Strings.

1. which is it? Parallel or single string. Those are mutually exclusive.
2.

Link panel datasheet
Link inverter manual

From what I understand of the manual, do not parallel the PV strings.
You can have one string attached (6 x 550W) to one inverter.
In your case 2 strings (3 x 550W) one to each inverter will probably not work as the VoC will be less than 150V. Inverter needs 150VoC to startup.