Screen to foam

DO they all have home switches wired and set up?
One way would be to set them as tandem axis, so X with X2 and Y with Y2, this should be easy as PncConf and StepConf can do that.
Just checked StepConf, it does that

Yes it is.
Until the machine is homed, LinuxCNC is in Joint mode, so it can not be jogged to prevent racking and damage to machine, while homing it moves both joints (or more than two joints) till any of those hit the home switch, the one on the switch stops moving and waits till the other hits home, then it backs both joints of off the switches and moves them to the values set as HOME_OFFSET in the ini file. This can be different for two (or more) joints so it makes it very easy to have the gantry or in your case the wire, straight always even if the home switches are not at the same exact position.
Very nice feature, for sure.
After homing, LinuxCNC goes into Axis mode, so say X axis is both X and X2 as one and the same axis. Now the machine can be jogged and used as usual.
To much?

Yeah, you will have to remove the Z stuff on ini and hal file.
Beware that ini also uses Z for geometry and display, so you would need to have XX2YY2, or similar for both.

You are welcomed, always.

What GUI?