You should always compare the RMS power ratings of both. In your case, the AMP will be putting out 300W RMS per channel at 4OHMs.
Each of the subs can take 400W RMS and are 4OHMs. So it will work, but you won't be getting them to max power.
I'd suggest that the amp you've selected will power a single sub adequately. If you run them in parallel, you'll theoretically get the 2OHM output which is 500W RMS-- 250 to each speaker which can handle 400.
You might be happier stepping up the amp a little, or just sticking with 1 sub.