Your 120 minutes is very confusing, but not part of the question.
Yes, for normal planning (planned within distance coverable in 60 mins with the approved OEI speed) the required airports along the route need to be adequate (the definitions and requirements are available in the regulation). That's it, no pre-dispatch WX conditions to fulfill.
ERA, on the other hand, is a nominated alternate (to achieve a specific goal) and just like any other alternate fields there is a mandatory WX limit to achieve before dispatch.