Those extension nuts are for playing Hawaiian style - guitar flat on your lap, fretting with a solid steel bar. I got one long ago. It didn't sound very good, & when I took it off after a few weeks it had dented the fingerboard from the pressure of the strings forcing it down.
For bottleneck - guitar in standard position, fretting with a hollow tube on one finger, like Muddy - you just need a guitar with a slightly higher than standard action. Many. perhaps most, bottleneck players use the bottleneck only part of the time, for expression, and fret notes with their fingers the rest of the time. So you don't want the action so high you can't play fretted notes.
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