If you want to succesfull cannon rush, you always rush with 2 Probes, 1 deception probe and 1 building Probe. This Counts on the other dude being lazy in base scouting, or him getting the "i found his probe im safe" factor.
Rushing with one probe is counting on the other dude being terribad.
On a 4 Player map you want to scout 2 positions at the same time with 2 different probes, once you find him, show him one probe, hide the other in his base. Build an OBVOIUS pylon behind his mineral or something to make him shift attention, then put up the real deal.
Make as little cannons possible while reaching his nexus.