Here’s my go-to setup: Source: IPhone XSM Amp/Dac: Fiio Q5s with AM3D module Amp Case: DD Audio Q5 Case iPhone Case: Burkley Case, magnetic removable cover I went with this setup because I didn’t like most common methods for stacking amps/sources. Here’s a rundown of my past experience and issues: - Rubber bands obscure the screen - Dual lock is semi permanent, and Adhesive is tough to remove. -Adhesive Tac Putty was a bit messy in warm weather/didn’t form a strong enough bond. My solution uses the bands on the DD case to attach to a magnetic, removable iPhone cover. This allows me to easily separate the two by simply pulling the magnetically attached cover from my phone. Magnets work to both keep the source to the amp via the cover, and they also work when the cover is folded over to stack the two on top of each other.