No question, two holes are better than one: I've got my screwdrivers lined up in a piece of wood I cut, sanded and drilled, then nailed to my shop wall.

There's just one hole for each screwdriver, and they're always loose and crooked.

From the website:
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Screwdriver Holders

These versatile screwdriver holders grip all types of screwdrivers with shanks from 2mm to 12mm (3/32" to 1/2") in diameter, either round or faceted.

Since they grip firmly with stacked sets of six-finger grippers, about 2cm (3/4") apart, they are able to hold drivers vertically or horizontally.

For drivers with handles up to 4cm (1-1/2") in diameter, an interlocking base feature makes spacing easy.

For larger-handled screwdrivers, the spacing can be increased as needed.

Mounting screws for 3/4" material included.
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A set of 12 (4 each in red, blue and yellow) costs $5.90.