The best options for staying under the overhangs will be on the Loge Level of Kauffman Stadium as these seats are almost entirely protected by the deck above.

To stay on the first base side of the Loge Level, you will want to be in Sections 312-325.

Loge Level
Nearly all Loge Level seating on the first base is completely covered and protected from the elements

If you prefer to be a bit closer to the action and on a lower level, the last few rows of the Plaza level also provide very good protection thanks to the overhang above. Sections 230-249 are the Plaza Level sections on the first base side, and you should have good protection from the overhang in Rows RR-TT.