https://www.amazon.com/gp/product/B075FS5B25/ref=ox_sc_saved_title_4?smid=AXQIDIXAA4G3A&psc=1
This is what I used. I also used a small piece of wood on the clip and attached the magnet to it. It works really well.
R Λ Z Ξ R Kishi, or Xbox Core Controller with MOGA PowerA Clip
Android Emulators are most compatible with those controllers. Use DIG as an organizer for all your emulators and some apps are still not optimized on Android 11 to use SD Card access but DIG can be used to bypass this if you plan to store games in SD Card. Otherwise, use emulators as you please without DIG.
You can use DualShock 4 controllers or DualSense controllers as well but sometimes there is a compatibility issues or remapping that has to be done for it to work properly with some Emulators. Up to you.
Yeah, I actually focus on where the battery connects to the PCB rather than the CPU, because for my use case (cloud gaming), with the S20 that rapid discharge into the system is where the heat really comes through strong.
I mostly went with the wasp wing because it was small enough that I could use it in conjunction with my PowerA MOGA Mobile Gaming Clip when I am playing games on my phone directly with my xbone controller...
The one thing that I don't care for is that if you are not plugged into an external battery you get mostly passive cooling (fan plus heatsink) so it's still not a perfect solution for fully mobile use, but the pad does get cold enough to develop frost when it is plugged in.