I know a lot of you work with Teensy. I’m wondering if you have any trick to mount it. Teensy has no mounting holes and I’m struggling to find a way to attach it to a surface without just letting it dangle around. I don’t really trust glue long term.
I shrink tube them and then hot glue it on a surface. If you need a screw hole then add a thin ABS plastic sheet slightly larger than the Teensy into the shrink tube.
I just used extra long headers and put it on one of the micro breadboards you can get of fleabay for cents. Granted, my installations are usually temporary so gluing a teensy to something isn’t my idea of “reusable”
I’m using a double sided rubberized mounting tape. It’s made by Scotch.
If a bigger case is not a problem then you could put male headers on and then pop that into female headers soldered onto pad board. I often use the octows2811 adapter or the audio shield with teensy 3.x, both of which have mounting holes. You can permanently solder these or use headers for modularity. If you’re mounting into a case then adhesive standoff legs are great, the glue on them is seriously good from my experience, it’s almost overkill for just a teensy + audio board stack!
These are designed for Nanos but Teensys fit too 
http://s.aliexpress.com/zQVrueMb
Try searching at https://forum.pjrc.com. Several options are mentioned there.
Good stuff. There is also a 3D printed model someone made on PJRC : https://forum.pjrc.com/threads/25115-How-are-you-Mounting-Teensy-3-3-1