The Ruiz Brothers made this real nice case for the iPad Pro 11″. I have been using one on mine since I got it. But it was missing the cutouts for speakers and microphones. I was able to find the Apple Accessory Design Guidelines and get the dimensions and placement of these items.
I got a Stickvise a while ago. Its a simple to use low profile pcb vise. The great part about it though is that its hackable. You can create your own jaw designs for it and attach them. The website has a hack your vise section.
I used the provided specs to make these jaws. They allow me to hold an Adafruit Circuit Playground board. This gets the board off of my messy bench to prevent any shorts. I designed it in Autodesk Fusion 360 and printed it out on my Lulzbot Taz 6.
The design is available on Thingiverse if you would like to print your own. Stickvise Jaws for an Adafruit Circuit Playground
*Disclaimer – The Amazon links are affiliate links that help me fund new projects.