If you end up getting a different case, you can put a plate under it, so that your mount will work. I use one of this with my spigen case.

Universal Metal Plate 8 Pack for Magnetic Phone Car Mount Holder Cradle with Adhesive (Compatible with Magnetic Mounts) - 4 Rectangle and 4 Round, Black https://www.amazon.com/dp/B07CJ453V6/ref=cm_sw_r_cp_apa_i_zad7Db29KD5ZW

Also, these kickstand can be stuck to any case

Spigen U100 Universal Kickstand Compatible with Any Cellphone - Black (US Patent Pending) https://www.amazon.com/dp/B01LW6NN8T/ref=cm_sw_r_cp_apa_i_8dd7Db7K9ARNZ

Also,

Is the pad magnetic or just metal?

if the pad is magnetic can you just stick one of these https://www.amazon.com/Universal-Magnetic-Holder-Adhesive-Compatible/dp/B07CJ453V6/ inside your phone case to make it stick?