Yep. Many put it under the seat and use the hole in the "snorkel" where the flapper solenoid used to be for zip ties. Velcro to snorkel, and/or zip tie it in place. (assuming you've gutted the AIS and flapper crap from under the seat)
Some people do have it mounted to handlebar or triple tree so they can see it and make changes to it easier.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs