Adrian/Uno is aiming to sell attested information about Enzo’s Umbra Project to a reliable “purchaser” (someone with an underground background who’ll potentially end the career/family empire of Enzo's once gaining evidence of his nefarious scheme). Doing so, I believe another reason he's partaking in Enzo’s schemes is that he wants his agency to make a comeback after Enzo's plummet, thus he’ll return to them after selling out the scheme.

I’m rereading for season 2 and I don’t completely understand why uno is spying on stefano