Scopes with big honkin’ eyepieces might be an issue when mounted low. By all means get the hammer spur sold by Henry.
If you look at the Henry SS, the hammer (when down) extends up above the receiver and the barrel a fair little bit. Low rings won't clear it. Of note, if you use rings that sit the scope close to the hammer when it's down, it may hit when falling as it arcs higher than were it sits when down.