Research: The typical conventions of a thriller teaser trailer

For this piece of research I'm going to be doing both primary and secondary research, I have chosen to do both types of research so that I get both a professional advice from finding up the typical conventions online, and I also get an audience perspective of what they expect to see in a teaser trailer/film to be able to identify the sub-genres.

I have made a questionnaire on survey monkey, asking questions about what typical things I should include in my teaser trailer and also if the ideas I already have are conventional or unconventional.
Here, is my questionnaire ------->> https://www.surveymonkey.com/s/BMKBM7D

I have printed off 10 questionnaires to give friends and family who would be my target audience to fill out so that I can get a better understanding of what I should be including in my teaser trailer to meet the conventions of a action/crime.
Below I'm going to list the seven questions that were on the questionnaire and what the majority answer was:
1. Do you think location is an important feature for an action/crime film?
Yes
2. If Yes, what sort of location do you think it should be set in?
Most people said a dark setting to create an atmosphere, one person said somewhere relevant to the plot, and another chose a busy city centre.
3. Do you think it's unconventional if I don't feature the villain in my teaser trailer often?
No
4. What type of outfit do you think the two brothers should be wearing?
Suits/Casual
5. Do you think weapons are a necessity to be seen in the teaser trailer?
It was an equal split between yes and no.
6. Do you think fast-paced and tense music is a good choice for an action/crime teaser trailer?
Yes
7. If No, what sort of music do you think would be better suited?
There were no answers for this question as everyone answered yes for the one above.

When I done my secondary research on the typical conventions, they used The Dark Knight as an example which is the example I used when I was pitching my original ideas for brief 2. The blog post I found on this mentioned how obviously the villain and the hero are both needed as main characters for both of these sub-genres, and most often the crime involved the villains steeling something valuable or being threatening to innocent people, location is an important convention in these two sub-genres and usually they're set in big cities where there are lots of people and lots of money because it's more of a threat then, one of the mise-en-scenes are guns because in crime weapons are usually the main source of a crime, also the villains are most often dressed in dark clothes because then it's easier for the audience to identify who the villains are. For camera angles there are a lot of close-ups to show the characters emotions and reactions to things, and also long shots to show the location of where they are, body language is also important if they are quite open then it shows that they are calm and feel in control, however if they are fidgeting then it shows they're nervous or anxious, the type of music used is most often fast-paced to create the suspense and engages the audience into the film. You can look at the blog post I looked at for my secondary research on typical codes and conventions here.