Originally Posted by sestivers
Mount it on the stem. Not sure what brand you have but Cateye can send you an adapter to do this. I'm sure other brands do, also. To me, it makes a lot more sense to mount it on the stem even if you don't have aero bars.
Except your bike computer most likely will not fit in that narrow space between the two clamps from the aerobars.
To the OP: either ride without a computer (easiest) or buy that computer mount. Profile makes one for their aerobars which will fit your forte bar, which is really just a profile Century knockoff.