they are a +18mm offset with a 5.71'' BS on a 9'' wide wheel. That is a great wheel size/spec. You should be fine but you should also take into consideration the width of your tires.
I ran the 20x9 Hoss with the same BS and offset on 35'' tires. They cleared the control arms fine at full lock.
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2007.5 w/ 6.7l, auto, XRT 175hp, Suspended by Carli Bilstein 2.65'' and some Carli extras
Class 7 Prerunner 520HP Ford, equal length i-beams/3 link w/ King Coilovers/Bypasses/bumps