The jacks themselves can be mounted either higher or lower. The thing to be careful of is if you raise the jacks you reduce the effectiveness of the jacks on uneven sites due to the stroke of the jacks. If the stoke on your jacks is 16 inches (stroke for 22K jacks) and they are 6.5 inches off the ground you currently have 9.5 inches of stroke for leveling. Raising your jacks 2 inches reduce the available stroke by 2 inches which would only level 7.5 inches of stoke for leveling.
These are kind of extreme numbers and are intended to illustrate the point only.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054