I used to have a TXR remote system Neil, and they are ok.
You have a transmitter that has cables that you plug in underneath, the other end of which plugs into the alarms. The receiver is then the same as any other fox receiver (ie RX).
One limiting factor is the length of the cables! If I remember rightly about 12" long, so if you like to have your rods spaced out, you can't, unless you seek out/make up some longer cables!
As for being compatible with the Microm M's, I don't know, you would have to have a look underneath to see if there is the appropriate socket. Or email Fox International.