Amp suggestion for large 2-way Speakers

Is it better to invest in a separate, standalone unit?

By "invest" you mean better quality (best performance/value for the money), resale value, easier to upgrade, etc.? Usually the lower the price range, the more likely integrated will perform better.

I wanted to clarify above that you were interested in separate amps for your high and low transducers instead of using bi-wiring, where you would have a single amplifier per speaker pair but an active crossover separate from the one in the speaker placed after your amp. That would require two active crossovers, one for each speaker (complicated, makes me wonder why not go straight to Dirac or other room correction/DSP).

The back of speakers shows only two Speakon connections - one labeled "L/T", and other "R/B".  I assume "Left/Top" and "Right/Bottom"?  I don't see any removable jumpers... at least not from the exterior.

I was under the impression that 2 separate amps would be ideal, although not sure what frequency crossover point would be best for each amp / driver.