You're talking a custom mod to add a 1/4-20 screw, and use a 1/4" to 3/8" bushing. Generally the best place to do that is using 3M epoxy on the bottom of the battery compartment. Keep an eye on weight and balance if you do that, not sure how much weight a fully kitted F360 entails. I've found the Inspire to struggle in p-ATTI after about 500 grams mounted like this. I've done this successfully with a 0.5" 1/4" 20 screw, a Fairburn multiplate (120 grams) and two 360Fly cameras (175 grams each).