There are many mounts for smart phones, I’ve been looking for a good one that can hold a small tablet. I’m actually using a PS4 controller with xcloud and someone else on here had linked to this one: https://www.amazon.com/dp/B07Z3QGK97/ref=cm_sw_r_cp_api_i_sXVBFb5Y9K2YF

It’s the only one I’ve seen with a telescoping clamp that goes wide enough for a tablet. I’m on my second one as the first broke in half. It’s very cheaply made, but Amazon sent a replacement. I’m hoping this one can last until the MOGA XP7-X is out. There’s not a ton of info on it, but I think it will work with the Galaxy Tab A.