2
The way I see it, you could do:
// Via the init hook, do all these:
register_post_type( 'library-books', [
'public' => true,
'label' => 'Library Books',
'rewrite' => [ 'with_front' => false, 'slug' => 'library/books' ],
'has_archive' => 'library/books',
// other args here
] );
register_post_type( '...
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