Here are to options to think about with mounting the VTX esc with the pigtail capacitors. The Black Edition pictured is actually one of Lee Martin's from the IFMAR Worlds - he just shortened the lead wires so the cap stayed right on top of the ESC. The orange VTX10R is one of my spares, I put it on the side, shortened the wires slightly (could have a little more, I am picky like that).

Its OK to shorten the wires on the capacitors, you really don't want to lengthen them, they loose efficiency at that point.