I made this antenna mount similar to a pinewood derby car in an attempt at aero. not sure if that helps or not but it does stay on my glass roof and it did work well with my signal stuff signal stalk on an NMO mount. Here are the NMO mount and suction cups I used. https://www.amazon.com/dp/B0CN97RWK5?ref=ppx_yo2ov_dt_b_product_details

https://www.amazon.com/dp/B09KRK7TXL?psc=1&ref=ppx_yo2ov_dt_b_product_details

Of course, you can modify it to use anything you want. I used 3 heat set inserts on the back to fasten the NMO mount to the printed part. I made mine out of ASA.