Front Window too slanted to attach anything via suction cups? This no drill vehicle mount from RAM may just be the answer for you

The RAM-B-316-1-202U consists of the RAM POD I universal No-Drill^™ vehicle base, 18” rigid aluminum rod, single B Size 1" ball socket arm and round base plate. The base of the mount connects to your seat rail without any drilling necessary. The 18" rigid aluminum rod can be bent to position your device to its optimum viewing location. The 2.5" diameter round base adapter contains the universal AMPS hole pattern. For proper fit, make sure your vehicle has an appropriate bolt to mount the base securely. The RAM-B-316-1-202U will not work with 2014 and newer Chevrolet seats that have the seat hook system.