I know this won't be popular but;
There are only 2 kinds of leaks
1) small- overhead or the like, or less than 5 gallons per day
2) large- hose lets go or the like 500+ gallons per hour or more
Then
If you have #1 situation and the pump keeps the visible water down to a gallon or less, then you won't know you have a leak, and will do nothing untill the leak becomes a #2 leak. Then the batteries go flat trying to keep up with this major influx and the boat sinks. Better to keep the float switch high or leave off the float switch entirely and just have the electric bilge pump wth a manual off and on. If you come to the boat and the floor boards are floating you will definitely know you have a leak. If you never see water in the bilge you'll do nothing untill the leak gets to #2 and sinking occurs since no known bidge pump wiill keep up with #2 for very long.