One installation problem was the sump where these pumps are installed is a bit shallow. As water pools in, it starts to spill over (making its way towards the stern of the boat) before the bases of the pumps become submerged, causing them to suck air, losing pumping efficiency. The solution was to install a "dam" (with spillways, you can see it in the video) against the opposite floor support, shaped to the profile of the hull, sealed in with a light duty silicone/polyurethane sealant. This effectively "deepens" the sump. Now these pumps are intended to pump out anything coming from the forward end of the boat. There will be pumps in the aft end, where the lowest point of the bilge exists near the stern tube.
Here is a video of the final test using the remaining water in the tanks.