I"ve got two floats in my sump.... one primary and one emergency... both tied into my Apex and programed. I have a pump in my RODI tank (55 gallon) on the other side of the room. I used soft tubing to run from there to the sump. The pump is controlled by the Apex tied into the two floats. The only problem I had was having a siphon created, so I ran piple from the pump up to the top of the water tank, and did a u -- where the pipe teas one line goes back into the water tank the other connects to the line to the sump. This pipe is higher than the sump so that breaks the siphon when the water turns off.
I'll try and post pictures this weekend. It works great!!