I think you mean eccentric adjuster.
I used to build them for a frame company, for a 3/4 inch axle the rotating element is around 2in od on the smaller part, without the flange. The clamping part would have to be about a minimum of 2.5 inch od, or bigger.
My guess is they will add a chain tensioner, part of the plan.... or it soon will be
Looks like around 2 inches of travel, anything is better than none... I doubt it is used offroad, so is probably OK for the street.. just use carefully..