I was listening to Sirius Radio the other day and it might have been Gil Brandt who said there are usually around 15 legitimate first rounders in most drafts.
So, for me, it depends how the draft falls. Miami is devoid of elite talent IMO and if they can get someone elite that makes sense. Those players can move the needle the most. New England has shown that you don't need a lot of elite players, but having one at quarterback sure has helped them. With so many quarterbacks expected go early, maybe even Mason Rudolph and Lamar Jackson, those top 15 could be there in the first 20 picks. If the Dolphins can trade down and still get a top talent, why not? If not, stay at #11.
Would love to have an additional 2nd rounder, though. Lots of talent there. Miami's second round targets could include Jefferson at LB, Harrison at S, Brown at RT, quite a few of the tight ends, definitely some running backs. Phillips at DT maybe.