"T" install with pipe

I have about 25' of SS pipe that has to be installed. My problem/question is how the vertical weight is held up. I have this bracket designed for that but the bracket is only 12" long. I don't see how all that weight is effectively held in place with such a small "foot print" on the wall. Especially if the anchors are only going through plywood and vinyl siding. I understand there are brackets up the length of pipe but that is for the horizontal steadiness not the vertical weight.

Is this the norm?

Edit:

Those connections should be made into studs, not sheetrock or siding.

Not to be a wise guy but....what do I do, move my stove to accommodate location of the studs? There is an alcove set up for this stove when I had my house built. The studs fell where they fell. I can not imagine every SS flue is tying into studs.