@kingofthegeeks this should be possible using firmware 3.3 but not with earlier versions. Prior to probing using tool 1 you will need to execute a new M557 command using U in place of X, e.g.:
M557 U0:420 Y25:410 S47 ; define mesh grid
Adjust the U coordinate range so that it is reachable by the tool on the U axis. This command tells RRF that you require a height map for the UY plane not the XY plane.