What are the spiciest enemies to lovers romance books?

Of the 28 enemies to lovers romance books smutrecs.com has rated, the spiciest are Den of Vipers (5/5), Sabotage (5/5) and Their Vicious Darling (5/5). 10 of the 28 are rated spice 4 or 5, on a scale from 0 to 5.

1. 
   Den of Vipers by K. A. Knight spice 5/5
2. 
   Sabotage by Shantel Tessier spice 5/5
3. 
   Their Vicious Darling by Nikki St. Crowe spice 5/5
4. 
   God of Wrath by Rina Kent spice about 5/5
5. 
   The Never King by Nikki St. Crowe spice about 4–5/5
6. 
   A Touch of Darkness by Scarlett St. Clair spice 4/5
7. 
   Sorrow and Starlight by Caroline Peckham spice 4/5
8. 
   Love Theoretically by Ali Hazelwood spice about 4/5
9. 
   My Dark Romeo by Parker S. Huntington spice about 4/5
10. 
    Things We Left Behind by Lucy Score spice about 4/5
11. 
    Astrid Parker Doesn't Fail by Ashley Herring Blake spice about 3–4/5
12. 
    Brutal Prince by Sophie Lark spice about 3–4/5
13. 
    Contract Bound by Elle Mae spice about 3–4/5
14. 
    Tempted by Deception by Rina Kent spice about 3–4/5
15. 
    Enchantra by Kaylie Smith spice 3/5
16. 
    Fourth Wing by Rebecca Yarros spice 3/5
17. 
    Starside by Alex Aster spice 3/5
18. 
    The Ex Talk by Rachel Lynn Solomon spice 3/5
19. 
    The Hating Game by Sally Thorne spice about 3/5
20. 
    The Viscount Who Loved Me by Julia Quinn spice about 3/5
21. 
    Set on You by Amy Lea spice about 2–3/5
22. 
    The Right Swipe by Alisha Rai spice about 2–3/5
23. 
    Under One Roof by Ali Hazelwood spice about 2–3/5
24. 
    Because of Miss Bridgerton by Julia Quinn spice 2/5
25. 
    Hurricane Wars by Thea Guanzon spice 2/5
26. 
    The Book of Azrael by Amber V. Nicole spice 2/5
27. 
    You Deserve Each Other by Sarah Hogle spice 2/5
28. 
    The Things We Leave Unfinished by Rebecca Yarros spice about 2/5

Each book page lists the sources behind its ratings. Ratings marked "about" are estimates. How we rate