Setup for squaring twin X-axis gantry

[EddyCurrent]

I've been thinking about this gantry squaring issue when two motors are used for the X axis.
If the gantry design consists of two tall end plates with unsupported rails between or maybe aluminium profile and supported rail, I can understand there might be a fair amount of flex between the two ends and in this case it might make sense to have two home switches.
In my case where the gantry is like this http://www.mycncuk.com/forums/gantry...html#post55076
it's rock solid and virtually no way it can go out of square as it's like one big lump of metal. With this in mind I'm proposing to use just one home switch for the X axis because I think the steppers will stall if they try to home independently and the AM882's will then trip out.
Any thoughts ?