You could use that 100w driver, but if you are going to run at 100% just be sure to keep the strips cool. The 240 would not work with just two strips. You would be below the CC voltage for it, according to the datasheet.
Sure would, just with the caution on cooling. You may want to check out the inFlux series from Samsung if you want to drive the 301B chip hard. These are a little more coin, but have aluminum backs like the HLG boards to help disperse the heat.
SL-B8V7N90L1WW is the L09 version, a double row strip that can handle 66W at 48V. Two would fit nicely on an HLG120H-48B.