The closer to the exhaust port the better. On my 08 the 18mm 02 bungs are about 6 to 8 inches away from the exhaust port in the front and around 8 to 10 inches away from the exhaust port on the rear.
My exhaust is a little different then your is because I run a true dual that has the rear head pipe exiting on the left.
The main thing to look for is to put the 02 sensors in a location that you can service them later on without removing the exhaust, both of my 02 sensors can be installed/removed without removing the exhaust.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.