Mitsubishi High Wall FCU & 2 Rectorseal SS610E Flow Switches

Hello!

We have a situation at a new residential project where the GC is requiring us to add a drip pan to the fan coil underneath to have extra protection in a Utility room. I would like to have an auxiliary float switch. My thought was to wire in series two of the Rectorseal SS610E float switches, but when I asked their tech support they have never tried it. Any of you ever done this? If it's not possible my other idea is tell them to speak to their security alarm contractor if they offer water leak detectors that could notify the owners via mobile app.