Exhaust hanger bracket help needed

I have a 67 dart with a 383/auto. has TTI headers and just ordered the TTI x-pipe this afternoon. I plan to run the collectors right off the headers into an exhaust dump out with the electric dump valves. this will then go into the x-pipe and into my flowmaster mufflers with turndowns in front of the rear end housing.

my question is this:

what are you guys using for hangers at the muffler? my car has no brackets what so ever under the car to hang the exhaust. i am able to fab/weld what ever needs to be done. i would like to weld something to the floor pan but worry about the vibration cracking the sheet metal floor.