Shove the slack up in front of the PCB, there's room the body is plenty tall. Don't let it get anywhere near the bottom or one of the side gimbals or it'll get mangled, sever the internal wires, and you'll have to hack together a splice and cover it with gorilla tape oh god what have I done. (I literally did this to mine yesterday, it's being held together with twist splices and tape. Don't be me.)
But seriously just shove the slack up in the front, the "seal" is a stress relief to keep the cable from being damaged by movement so you want to make sure it's located properly.