Best place for line loc switch?

I'll use the line lock to hold the car at the line. I like to keep my hand on the shifter becasue first gear doesn't last very long. That means I have one hand on the wheel, one hand on the shifter. The button needs to be in one of those two places. I have the T handle with built-in button.

If you just want it for screwing around (nothing wrong wioth that), then location is less important.