Likely OK airbag wise, but worth pointing out the side curtain airbags in each a-pillar, as well (labeled as such I am 99% sure). However, they should simply act as side curtains and not be up top.
Scanners still could come loose and become a flying object in certain situations but so can anything in the vehicle. Bottom line is each person does their install the way they see fit. However, it is not uncommon for others to "look out for you" and give suggestions for safer installs. It's happened in many threads and I've made suggestions myself before so certainly don't take it personally at all, either.