For my Galaxy Note 10.1 and Tab S4 I invested in a spare cover, removed (cut off) the front part (that normally covers the screen) and made two holes in the back part to tightly screw it to a music stand (e.g https://www.thomann.de/gb/thomann_or...ult_deluxe.htm) with music holder removed. This proved to be a good setup, much better than using one of those universal holders.