Oh I know those! I had one for the iPhone 6s, but now my 12 Pro is obviously bigger, so it doesn't fit.
So, I 3D-printed one of those holders that holds an XBox controller and your phone above it. A bit heavy, but works perfectly for all controller-enabled games! And worthy of mention, Geforce Now also works! So I'm "PC-gaming" from my bed with this, and all for "free" (if you don't count the cost of the plastic, phone, or controller lol).