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I don't know which one is accurate. They all sound right to me.

The cameras need to be mounted in spots that intruders can’t reach.

The cameras need to be mounted in spots where intruders can’t reach.

The cameras need to be mounted in spots which intruders can’t reach.

marked as duplicate by Lawrence, Glorfindel, tchrist Apr 8 '17 at 16:28

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    All are grammatically correct, and you could even drop the word entirely. – eyeballfrog Apr 5 '17 at 22:00
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They are all grammatically correct, but there are distinctions worth noting.

Where is specific to spatial positioning, which means you could remove the phrase "in spots."

The cameras need to be mounted where intruders can't reach.

Writer's digest outlines the distinction between "which" and "that" here:

http://www.writersdigest.com/online-editor/which-vs-that

The basic idea is that if the clause that the word is connecting alters the meaning of the sentence, use "that," but if it merely adds extra information, use "which." In your case, the meaning of the phrase is largely lost without the connected clause.

The cameras need to be mounted in spots.

For that reason, "that" is probably preferable over "which," although it is a unique case where I could see arguments made either way.

For these reasons, I would rank the options like this:

  1. Where
  2. That
  3. Which

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