I was just thinking of this question and thankfully found your post before asking it. I love to read accurate historical fiction so I hope you get more answers.

Herman Wouk's "Winds of War" and "War and Remembrance", about World War II, are both terrific. The books center around Pug Henry, a US naval officer who reluctantly becomes an aid to FDR. He is sent all around the world and meets Hitler, sees the aftermath of the battle of Stalingrad, attends the Yalta Conference, etc. There are excerpts from a (fictional) German military strategist who discusses the battle of Midway and other significant military actions. Other characters highlight other aspects of the war such as the plight of Jews in Europe, the submarine war in the Pacific, etc. Both books are very interesting and Wouk strived to be accurate.

Gary Jenning's "Aztec" is a page-turner. Here's a link to an r/askhistorians thread about it.