Remember the water level will drain to the level of your return nozzles. I made this mistake once, had em pointed down. Luckily I turned off the pump, not power outage. Before I had to turn my valve off I had filled up my sump and 5 gallons of water on my wood floors.I just increased the height of the sump by an inch because of the rise in the baffles height. I am going to try to calculate the volume of water in the overflow plus water in the pipes.
Edit. Aproximately 10 litres (2.64 gallons), 5 from the overflow and 5 in the pipes. I think it's fine.