Microsoft Flow has trigger action When a new response is submitted where you have to set Form ID to listen this event when MS Forms is submitted. And it takes only one Form ID value in this control.
So, unfortunately, there is no way right now that you can make common flow to listen all your MS Forms together. You will have to create separate flows for them.
IFIf you have same sort of questions in all forms and you have a requirement to hide/show questions based on earlier question's answer, then. Then you can manage all types of forms within same form, at that timeand in this case, you can use samewill need one flow because ultimately you have one form to manage.