I installed the float switches to the Profilux. Same configuration I had with the Apex. I use 2 switches 1 for low water in the sump, which turns off the return pumps, and UV, and 1 for high water which turns off the Skimmer so it doesn't overflow.
The switch holder is very ingenious, all plastic/acrylic and fully adjustable yet secure once you tighten it up.
The pic shows it with 1 float and 1 optical. I went with 2 floaters. The optical looks like a great way to go, but I chose to save a few bucks and go with the floaters.
The only issue I had was the Profilux uses 1 socket for 2 switches and you use a splitter. The socket is labelled 1&2, yet in part of the programming I had to use 3, seemed strange, but I'm sure there is some reason for it.
If you're installing something like this, I had to use "control circuit" 3 and 2 for the rest of the settings.
If you were doing an ATO, you can select that and the software seems like it sets it up with a few clicks.
At this point everything I was doing with the Apex is now being done with the Profilux. I am really enjoying this controller. I will probably be adding some stuff to it, the touch display looks very cool, and I will probably add the salinty and redox probes (the cards are already installed in the 3.1NEX) and I'd like to add another power bar, and possibly the breeze fan. I'll update here as I add to it or if something noteworthy comes up.
If anyone has any questions please let me know.