Thanks Stony, super treatment of a trick topic!
It helps to know that WGt uses normal rounding for elevation differences; it's in feet if lie is off the green, and in inches when your ball is on the green.
So, if the target is anywhere between 1.5" - 2.5" above or below your lie, the display will read (up or down) 2". Since I'm a formula putter (with adjustments for elevation, break, and wind) and add 1.5 ft on flat or uphill putts to avoid the 'never up, never in' syndrome, on the initial aim check from reverse view I drag the aim arrow towards me that 1.5 ft beyond the hole and note the elevation at that point for use in adjusting the flat formula result.
Downhill and/or downwind putts - especially at the 'O' courses - I may reduce or even remove that 1.5 foot safety factor, depending on how severe the drop is and the length of the putt.
One last point: if the break is very severe, your ball will take a significantly longer path to the hole than the 'as the crow flies' displayed distance. On putts longer than 6 - 8 ft, you may need to add a bit more power. How much? Depends on severity of the break but I use ~5% if in doubt.