Unfortunate that the dent is on that swage line in the panel. That will make it more difficult to pull out and the line will actually strenghthen the deformation of the panel. Can't imagine you would get anything with suction to stay attached because of that raised line. A flat panel would have a chance with a suction cup on it and may pull out. This is one for the pros. A paintless dent removal expert may be able to spoon it out from behind if reasonable access. Failing that, it's a body shop.