I think the Packers need a vertical wide receiver who can step in immediately. Watson won't be in that role for at least half the season and he might not be effective for any of it.
Darius Slayton of the Giants is the clearest option. I would guess he gets some kind of markup on the Gabe Davis deal (3/39). D.J. Chark could be a budget option if he's healthy.
At defensive tackle, assuming the Packers let Slaton walk, they need to replace about 425 snaps at the 1T/NT spot. I could see signing a guy and drafting another in the middle rounds because Clark isn't really that player anymore.
B.J. Hill of Cincinnati is probably the most brand-name option out there, but I'm more intrigued by a couple of LA products: Bobby Brown III (Rams) and Teair Tart (Chargers). If the Packers were inclined to trade Devonte Wyatt, one of the best FA options this year regardless of position would be Milton Williams from Philly.
At defensive end, this draft class seems rich so I probably wouldn't wade into the market unless it was for a serious difference-maker or for a guy who brings a skill-set they don't current have (i.e. a skilled high-side rusher).
The difference-maker would be Khalil Mack (LAC). The speed rushers that I like are Baron Browning (ARI) and Azeez Ojulari (NYG).
The spot that needs immediate help more than any other is undoubtedly cornerback. I don't think the top guys on the market warrant a big contract, so I'm inclined to take multiple swings on tier 2 options or maybe make one solid signing and then one budget signing.
The guys I like in this FA class are Byron Murphy (MIN), Paulson Adebo (NO), Kristian Fulton (LAC), and Nate Hobbs (LV).
So that's...
WR:
-D. Slayton, NYG
-D. Chark, LAC
DT:
-B. Hill, CIN
-B. Brown, LAR
-T. Tart, LAC
DE:
-K. Mack, LAC
-B. Browning, ARI
-A. Ojulari, NYG
CB:
-B. Murphy, MIN
-P. Adebo, NO
-K. Fulton, LAC
-N. Hobbs, LV
Funny that there's a Charger at every spot.