I don't know anything at all about the probe plugin -
But what I always do with new code or anything new on a machine, is put a piece of material (usually a bit of flexible plastic tubing ) that approximates the tool, (or in thsi case your probe) and have a go. At least if if hits anything, you wont hurt it.
I have a simple probe, which works very well and stops on a plate using G31 instructions, but have not tried anything more adventurous.