you need mount of IR sensor on drone to attach battery mount.

⚠⚠⚠⚠Mount in Straight Manner not in side like i did , Which will impact with Propeller
 

.you should do test print the 1.stl  then print 2.stl , you have to fix 1.stl with 2.stl using Glue.
1.stl dimensions should be changed depending up on the drone