Ok. Here is my 2cents. If you want to buy the controller. Then lets use it to some of its potential.
Tunze 3155 - $200 + Apex 239 . Total 439
Nano 3152 - $100 + Apex 239. Total 339
I would do the following.
Apex $239
2 float switch holders and 2 float switches $25
This is just an example. You find cheaper and the float switches are around a couple bucks.
https://www.ebay.com/itm/White-Magn...et-/162357293071?_trksid=p2385738.m2548.l4275
Neptune I/O Box $40
So now your total investment is about 300. You get your ATO and controller and you saved money. You run your float switches to the I/O box to your apex. You program it on and off. Pretty simple for your ATO to kick the pump on and off. The second one is for backup in case the first one fails. I put my second one a little higher up in the sump. When It goes on, it sends me an email. This is just an option for you to think about.