Well, you didn't tell us what kind of car you have, so no idea what will fit it.
You'll need to figure this out. There are companies that make brackets that go under trim and then you use the AMPS mount hole pattern to attach this:
PRODUCT FEATURES Compatible with devices having the 4-Hole AMPS pattern, radio remote head brackets, including vehicle-specific mounts, cameras, GPS, and satellite radios Low-vibration 4-Hole AMPS mounting pedestal base attaches to solid, flat surfaces 2 year limited warranty PRODUCT DETAILS You...
www.lidoradio.com
Or, you get the above mount and use a Ram ball with the high bonding tape.
Or you get this mount and you stick the little pad to the dash and attach the suction cup mount:
This extremely strong with plunger action suction cup can be attached to your windshield. This package comes with a plate that can be attached to your dash or windshield so you can attach the suction cup mount to your dash or console. One side has a very strong 3m adhesive which can be removed...
www.lidoradio.com
Or you do the cup holder mount:
PRODUCT FEATURES Features 25mm (1 inch) ball head Mount base expands to up to 3.5 inches in diameter 2 year limited warranty PRODUCT DETAILS This heavy-duty car cup holder mounting pedestal features a 25mm (1 inch) ball head and is compatible with Lido or other third-party 25mm device holder...
www.lidoradio.com
But unless you tell us what kind of vehicle you have, we're all running blind here.