Axyz retrofit - limits and homing

Please excuse the n00b questions as I work to setup my small AXYZ cnc router. Does anyone know how I should
implement limit switches in Linuxcnc? The factory wiring of my old millennium cnc router has a single blue tipped inductive proximity limit sensor on each axis. The sensors are located at the top of the z-axis, front of the y-axis and left on the x-axis. Each sensor has connections notated sig, 12v and ground. 

My assumption is that these are NPN, Normally Open (NO), but will confirm:

• Normal state (no metal detected): Sig wire outputs ~12V

Activated state (metal detected): Sig wire outputs ~0V

Two questions:
1) Will these play nicely with the 7i96s card I’ve ordered?
2) Are these be sufficient for homing the router? 
 

Thanks for the reply. I have LinuxCNC installed on a computer now but I’m still waiting for the Mesa card to arrive (should be this week). When you wrote ‘Mesa manual’ do you mean the ‘7i96s Ethernet Step/Dir Motion control interface’ document? If so, I’ve read it but will admit to not fully understanding all of it (yet).