Suppressors Recommendations for 2 HK 9mm

I’ve got a USP Tactical in .45 with a KAC can and a AAC TiRant.
Not really relevant to what you have.
Lots of people like multi caliber cans. I don’t. There are enough compromises inherent in any suppressor that I’m not interested in adding another by trying to make it work on multiple calibers.
Inches and ounces add up quickly on the end of a pistol.
I don’t have a recommendation on a suppressor for your gun, but I would definitely get a 9mm can for a 9mm gun.
While I like to have the latest and greatest rifle and rimfire suppressors, pistol cans are more of a novelty than anything and the ones I bought 15 years ago are good enough for that purpose.