There is no issue with sensor mounted after nozzles. If your ecm makes changes based on air temp.. then there can be issue. You need to discuss this with your chip maker/tuner.
Mine is mounted inside my intake manifold in the back, underneath the coil pack area.
Been there for years.. no issues.
Before alky to me is a waste.. no way to datalog the temps.. and if I see my intake temp at ambient I know my alcohol system is working as should. No guess work.