Omni is a little iffy on the 16 bit platform, something with the grounds. I'm using a Zeitronix, which is the same as AEM.
Still on stock IAT, but most are putting it in the intake manifold. Bast is to use it with a plastic bushing so you isolate from heat soak. Near the PCV is a popular place. The T1 race development IAT is the same calibration, but 1/8 NPT. More expensive, but easier to get where you want it.