I don’t think you want to place the cleats in the middle of your foot. This might work for flat pedals but not so much for clipless. If you have heel drop issues, then some of the TR sessions will give you good training advise such as increase RPM and loosen tension on your lower legs and feet. Don’t mash, but spin.
Normally speaking the cleat should be placed half way between the head of the big and small toe metatarsal bones. Check out Cam Nichols on YouTube, he has a few bike fitting videos and they discuss the Steve Hogg way to fit shoes, clips & bike.
You may want to try SpeedPlay clipless as there is a wide range of adjustments. And if you do road cycling, and depending on your budget, a shoe with stiff sole will be very helpful.