Before the Adams trade (when I wasn't believing Packers are going to sign a big name WR rumor) the Packers were linked to rumors about
Smith Schuster from Steelers
Landry from Browns
Juilo Jones from Titans/Falcons
The first two being great route runners but not the fastest, I believe Smith Schuster is also known for being physical with blocking and he was a GREAT #2 WR, though average #1 guy.
But under Mike McCarthy the Packers got a ton of #2 guys and would just beat on teams #2 and #3 CBs all games, even more so if one of them could beat the #1 CB times.
Get muliple guys, and maybe a TE or two...
Free Agent Tight Ends include
Big Bob Tonyan
Jared Cook
Jimmy Graham
Rob Gronkowski
Austin Hooper
Kyle Rudolph
Eric Ebron