I designed a Collective CORE mount using Tinkercad which you can find here. I figured id create this because even though CORE has screw mounts, this is still very handy to quickly and easily remove and then pop back in.
Just to let you know this design does work and was used for sometime. It never moved or fell out in fact it did the job perfectly.
Also it was mounted vertically. Feel free to remix the design if you want I don’t mind in fact I welcome people refining this for their purposes it’s why I posted it
EDIT: good point though I have just added an example in my post to show it in action.
As per the Thingiverse link here you can see the print setting details including the material used.