As a guy who played in bluegrass bands for 35 years but never once played with a drummer I'm not one to offer advice...but

filter RD's on roots or Americana and you will find a few. We don't start from styles so I have no idea which ones these might be in.
We've often used:
RockRootsEv
AmericanaRootsEv
NashvilleEv (many multi-genre RD's in the N'ville collection are Americana good)
FunksanfranEv (odd but it works)
Sometimes we include a conga or shaker RD track.
We frequently use 8ths RD's and RT's to have a more minimalist open sound that FWIW we associate with Americana. And for RD's we never use busy RD's or even a ride cymbal as we like for the tune to sound "open" (floyd put us on to that years ago).
While we frequently build our blues tunes around swings and shuffles most Americana tends toward the ev side of things IMO. Again that depends on how big your Americana tent is. When we think Americana the following still performing artists come immediately to mind.
Lucinda
John Hiatt
The Waifs
Kevin Welch
Kevin Gordy
Steve Earle
Son Volt
Wilco
Gillian Welch
Lyle Lovett
Slaid Cleaves
And many, many more. The more time passes the more roots rock, blues, folk rock and even R&B music gets labelled Americana.
Pardon the ramble.
Bud