Is there any way i can deselect "Suggested Videos" as a placement for mobile FB ads?
CPC differ quite a lot between "Suggested Videos" & "News Feed":

0.42€ vs. 0.14€ ...
PS: how do i include an image properly in a post and not only as an attachment?
I'm not sure how you're getting a "Suggested videos" placement option on MNF, I've never come across anything like that.
Anyhoo, I suggest you run at least 3 duplicate adsets for each placement b4 you make a decision. Costs will probably vary greatly. On your example, run at least 6 adsets, 3 for each and probably with lower daily budgets each of the 6. Then make a decision and you might be surprised too to see that ROI could be higher on one or two of the most expensive adsets.
It's good to know there is Suggested Videos placement on FB.