An alternative if you have trouble seeing/reaching the boot and don't mind drilling is to drill a new hole: Just above the gas pedal to the right is a square recess in the interior firewall insulation. Many of us have drilled this area safely. It comes out on the engine side just under the ground strap near the top center of the engine compartment. So it's very easy to reach and see. If you do this, make sure you grommet it and seal it up really well. Here's a picture from the driver footwell.
And a not so good picture from the engine compartment:
