The voltages add when in series and the current adds when in parallel.
With 8 in series, the Array Voc is 37.2 x 8 = 297.6V
However, with 2 MPPTs, the strings are not in parallel, there are two separate Arrays. The Isc of each array is 13.6A.
On the white label, both MPPTs have Voc of 297.6 and Isc of 13.6A.
The red label is a bit confusing. With no other instructions, I would say the Max Voc of the system is 297.6V and the Max Isc of the system is 13.6A.
Where are these labels coming from? Who is requiring them?