Hi Ralph, I found in Thingiverse "VIVE+contrller+mounts", there are 3 models and I choose "Vive_Controller_horizontal_mount"
Vive_Controller_Horizontal_Mount.obj I also printed "Hot shoe tripod adaptor" and fix it with glue. I also used Hot shoe adaptor with screw that I bought in Amazon. (attached images)
IMG_2343.HEIC
IMG_2342.HEIC