The e-bikes are located in the public bicycle parking area of the Circle. As you enter the Circle complex turn left and follow the bicycle signs until you reach Fahrrad 1.
The Teslas are accessible in the P4 car park. When you enter the Circle complex turn right and follow the signs to P4, the entrance is located next to the Hyatt Regency. Go through the automatic doors and take the elevator down, when you come out of the elevator turn left and the Teslas will be in front of you.
When returning the Tesla follow the P4 road signs.