Can applying for different but consecutive jobs at the same insitution be perceived as wrong? I am applying for different postdocs at the same institution. They hire during the year in different subfields of my main field. 
I already read some questions related to my problem (here, here, here), but I think that my situation is little bit different, because I just keep applying to one institution. 

My situtation, consecutively:


I applied for a fellowship to one professor for a specific project. It was not successfull.
In the same time, a similar position in a different group popped out. I'v asked the professor what he thinks, and he advised me to apply for it. No success.
Several weeks later, the professor told me that he discussed my CV with a different group. They want to invite me for an interview. 
Now, a new postdoc is available. I am thinking of waiting for the result of option 3 and than apply for option 4. Or should I apply for both at once? 


What if they will not hire me now, but a new job will pop out in a few months? 
I would like to know whether they can perceive me as someone who want to be hired to a particular institution and a particular country rather than someone who want to be hired for doing research.
Disclosure: I applied for two positions at the same time in the same department and it worked out fine for me.

Clearly, I think doing this is fine. And I wouldn't be particularly worried about being perceived as trying to work in a particular country/institution if you're appropriate for both positions. Make sure to write your cover letters appropriately - both of them should speak to your interest and qualifications for that particular job.

You might, however, consider informing the people involved that you have applied for both positions. This lets them discuss you in the context of which position might be best for you, etc. For example, if Option 3 is super-interested in you, then Option 4 can take that into consideration. Or if strategically one is having a harder time filling their position, etc.