At this stage of the alpha hooks are not supported on the server yet, so that’s hard to say for sure.
For the specific case of “provide reactive Meteor data to React components through a hook”, though, I’d say it’s likely not going to be a problem : the current implementation of the withTracker(reactiveFun) HOC basically just does
if (Meteor.isServer) return reactiveFun(props), and a useTrackerHook(reactiveFun) will probably do the same (that’s what my PR linked above does, for example). So if you had no problem running the withTracker HOC on the server, I don’t think a useTracker hook will cause more issues.
Not sure how the other hooks used by your components will behave on SSR, since that’s not implemented yet in React.