If you use some AT8410s, you should be able to angle the mics with those while keeping the vert bar vertical. For added heighth and angling capability, a goose-neck extension comes to mind. As for keeping the stand from toppling, either conterweight the bottom or angle the goose-neck backwards as well as down so the center of gravity remains over the stand, not in front of it. You'll sacrifice a little heighth but gain stability.