Which of the following shows the correct use of bracketing commas?
"The last chapter of the first section is set, in contrast to the preceding ones, in the couples' home."
OR
"The last chapter of the first section is, in contrast to the preceding ones, set in the couples' home."
In both examples, the additional information within the pair of commas are the same. I am confused about the point where the rest of the sentence could be split. Is there a general rule regarding this?