MP2 8000 + 2 x MPPT 250/70 make sense for 10Kw Panels + Batterrys

I think your setup will be fine with a mp2 10kva, just keep in mind that your mp2 can only invert 8kw of electricity to the grid. You can not put MP2’s in parellel above the 5kva model. Then you require an external transfer switch.