When using bed leveling the Probe cannot leave the bed area.
So if I take the Y offset and add it to the Back Probe 245 + 25 = 270 the is the same as my bed Y AXIS.
Given your numbers and leaving a 10mm border your Left Probe position should be 38.
#define LEFT_PROBE_BED_POSITION 38
and You right bed position should be 150 - 28 - 10 = 112
#define RIGHT_PROBE_BED_POSITION 112
#define FRONT_PROBE_BED_POSITION 15
#define BACK_PROBE_BED_POSITION 215
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Clif,s Data
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define X_MAX_POS 220
#define Y_MAX_POS 270
#define Z_MAX_POS 185
#define X_PROBE_OFFSET_FROM_EXTRUDER 0 // X offset: -left +right [of the nozzle]
#define Y_PROBE_OFFSET_FROM_EXTRUDER 25 // Y offset: -front +behind [the nozzle]
#define Z_PROBE_OFFSET_FROM_EXTRUDER -0.5 // Z offset: -below +above [the nozzle]
#define LEFT_PROBE_BED_POSITION 10
#define RIGHT_PROBE_BED_POSITION 210
#define FRONT_PROBE_BED_POSITION 25
#define BACK_PROBE_BED_POSITION 245
So if I take the Y offset and add it to the Back Probe 245 + 25 = 270 the is the same as my bed Y AXIS.
Given your numbers and leaving a 10mm border your Left Probe position should be 38.
#define LEFT_PROBE_BED_POSITION 38
and You right bed position should be 150 - 28 - 10 = 112
#define RIGHT_PROBE_BED_POSITION 112
#define FRONT_PROBE_BED_POSITION 15
#define BACK_PROBE_BED_POSITION 215