Ah thanks.
I’ve only really had experience with a TE stick, but I’ve been experimenting with slanting it with a cloth or something (with the far edge raised up) because I also find it more comfortable.
I said flat but i’m pretty tall so just by sitting in a normal chair, my knees are higher than my waist. So essentially I get the slant from that 
flat.
I prefer flat for lap play and sloped for desktop play.
That slanted mini-box is sex.