What are the spiciest arranged marriage romance books?

Of the 8 arranged marriage romance books smutrecs.com has rated, the spiciest are Broken Whispers (4/5), Neon Gods (4/5) and Bound by Honor (about 4/5). 4 of the 8 are rated spice 4 or 5, on a scale from 0 to 5.

1. Broken Whispers by Neva Altaj spice 4/5
2. 
   Neon Gods by Katee Robert spice 4/5
3. 
   Bound by Honor by Cora Reilly spice about 4/5
4. 
   My Dark Romeo by Parker S. Huntington spice about 4/5
5. 
   Brutal Prince by Sophie Lark spice about 3–4/5
6. 
   Throne of Power by Rina Kent spice 3/5
7. 
   The Bride Test by Helen Hoang spice about 2–3/5
8. 
   A Dance with the Fae Prince by Elise Kova spice 2/5

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