I think it can depend on the MATZ in question. Personally I'd be minded to give an RT call, advising the MATZ that I am transiting overhead at **** ft on whatever heading etc... You don't have to do it but I think it's good manners. Gives them the opportunity to advise you anything relevant whilst you are overhead.
That way good relations are maintained and then when you request to transit through a MATZ you are more likely to be favourably received.