For fiction books, I don't put the TOC into the flow at all. If somebody wants to pull up a TOC through a reader-specific UI, great, but IMO, it isn't of much value in a fiction book, so I don't feel the need to draw attention to it.
I do include the other standard pages, though—teaser, title/verso (copyright), and "reviews". Of course, the "reviews" for my books are basically spoofs, e.g.
I've never been bowled over so much by a book before.
—Victim, great book avalanche of 2023
so it isn't quite as egregious as it would be if I put actual reviews at the front of the book. If anything, they're the opposite of self-praise.