Miami's pass protection was good enough in 2017 - 11th in adjusted sack rate, according to Football Oustiders*. And it also performed well on short-yardage situations and helped create a lot of big runs (7th and 4th ranked by FO). The problem is that Miami gets stuffed at a very high rate, and they get RB's to the 2nd level at a low rate (30th and 20th). Miami ran best off Left Tackle and Right End (22nd and 18th), but those only account for 12% and 9% of Miami's rush attempts, and, as I'm sure you noticed, 22nd and 18th isn't exactly good. Left End, Mid/Guard, and Right tackle all rank bottom-3 (31st, 31st, and 30th). Miami runs into this terrible threesome 79% of the time, so it's no surprise that FO ranked them the 31st rushing offense in the NFL.
But, if you can protect the QB, you can afford to be a little patient on OL. With the exception of Pouncey, it's a pretty young group, and it should get better with another year of experience in 2018. Depending on how the board falls, I'd start looking for value at 42, but 75 could be in play for a starter.
At 42, Connor Williams, James Daniels, Isaiah Wynn, and Jamarco Jones would be very attractive to me.
At 75, Orlando Brown, Chukwuma Okorafor, Tyrell Crosby, Will Hernandez, Frank Ragnow, and Mason Cole would all make me happy. Billy Price, Braden Smith, Martinas Rankin, and Mike McGlinchey wouldn't bother me either.
If OL is not on your early priority list, and If you're patient and wait all the way until 107, one of them probably slips through the cracks. We'll see if any have especially terrible Combines or disqualify themselves in some other way. If Miami misses on talents like Smith, James, Edmunds, Elliott, Vander Esch, etc., it might be worth selecting one OL position at 42 or 75 and another at 107 (assuming one falls). But, Miami has more significant problems than a lack of a consistent run game, and, ideally, they'd be able to spend significant resources on the the 2nd and 3rd levels of the Defense.
My (realistic-ish) dream scenario is Roquan Smith at 11 and DeShon Elliot at 42. Add speed at LB and a young, versatile, instinctive FS, and it does wonders for a D that still needs a pass rush. I'd love to add Bradley Chubb at 11, but that doesn't seem realistic. I'm not sure if Miami would or should trust Davenport to play a significant role early, and it needs an every-down player with the 11th pick. Derwin James and Leighton Vander Esch or Malik Jefferson would also work for me, but only if the DC was on board with using James as a match-up piece. We still have some more info to work through, but Miami has to prioritize speed, physicality, and instincts/play-making ability at the 2nd and 3rd levels.
It doesn't seem like Miami wants to spend much on OL, so I don't think they'll find more than a rotational player in FA. It's a good draft to look for value at OG and C.
http://www.footballoutsiders.com/stats/ol *