If it’s just for road, you probably want a full slick
Schwalbe G-One Speed come in 700 x 50mm (29 x 2.0) and 29 x 2.35. The former is tougher I think as it has extra puncture protection under the tread. I had some — they are lightning fast
Hutchinson Override come in 700 x 45mm, and look good
Gravelking SS some in 700 x 43mm, although are a semi slick. They only do a full slick in 700 x 38 as largest
I wouldn’t want anything less than a 45mm on 30mm rims, although the below from WTB suggest 42mm is OK. That’s assuming you mean 30mm internal width, right?